Export Packing Standards Checklist

Direct answer

Export packing standards are a stack. No single stamp makes a pack seaworthy.

What standards stack applies to export packing?

A professional ocean export pack is specified against several independent frameworks: ISPM-15 for solid wood packaging material and phytosanitary clearance; DIN 55473 (and related sizing practice) for packaging desiccant units inside sealed free volume; barrier material performance language (often commercial reference to families such as MIL-PRF-131 class laminates) for moisture envelopes; ASTM D6251 / D6039 style construction language for wooden boxes and crates when buyers demand defined case classes; the CTU Code (IMO/ILO/UNECE) for packing and restraint of cargo transport units; and ISO 780 for handling pictograms. Insurance and sales contracts may also require adequate packing for the voyage. Treat each layer as a separate pass/fail, then close with a multi-layer pre-shipment checklist.

System context: what is seaworthy packaging Â· system layers Â· procedure: how to pack a machine for export.

Export Packing StandardsISPM-15DIN 55473CTU CodeASTM D6251Pre-Shipment Checklist

On this page

Full export packing standards table

Use this table as the RFQ and QA map. Expand each row in the sections below. Claims here are commercial and educational; always read the current official standard text and the destination countryâ€™s rules for legal decisions.

Standard or framework	What it governs	Buyer meaning	Common failure if missed
ISPM-15	Solid wood packaging material (WPM) in international trade: treatment and official marking	Pallets, crates, boxes, skids and dunnage can clear phytosanitary inspection	Hold, re-treatment, re-export cost or refusal of non-compliant wood packaging
DIN 55473	Desiccant unit method for packaging desiccants (unit definition and performance language for bagged desiccants)	In-pack moisture control is sized and specified, not guessed by bag count alone	Under-dried sealed volume, condensation on metal, rust and electrical faults
DIN 55474 (context)	Related German packaging desiccant practice language often referenced with unit-based sizing discussions	Buyers and engineers share a common vocabulary for desiccant quantity logic	Inconsistent RFQs; wrong free-volume assumptions; mixed bag and hanging systems without a plan
ASTM D6251 / D6039 style	Commercial construction language for wooden boxes and open crates used in shipping	Defined case or crate class / style rather than â€œmake it strongâ€	Undersized base, collapse, tip, or claim that structure was never specified
MIL-PRF-131 class barrier (commercial reference)	Performance family language for flexible barrier laminates used as moisture envelopes	Foil or multi-layer barrier bag/liner capable of supporting long sealed dry storage or transit	Permeable film used as â€œbarrierâ€; humidity equalises; desiccant load wasted
CTU Code	Packing, securing and documentation of cargo transport units (containers and similar)	Cargo will not shift; mass distribution and restraint are professional	Load shift, unit damage, injury risk, carrier refusal, claim complications
ISO 780	Pictorial marking for handling of packages	Dock and warehouse crews understand lift, orientation and care without reading a language	Wrong sling points, inverted cases, broken packaging from handling ignorance
Seaworthy / adequate packing (contract and insurance practice)	Whether packaging is reasonable for known voyage risks	Pack is engineered for ocean threats, not only for yard storage	Disputed cargo claims when packing is argued to be inadequate for the voyage
MIL-STD packaging practice (buyer reference only)	Military packaging methods, levels and preservation practice that some commercial buyers cite	Structured preservation and method language for high-value metal cargo	False â€œcertified MIL-STD packâ€ claims without a real method callout and verification
HPE packaging guidelines (industry association practice)	German-language industrial packaging culture used by many European engineering exporters for case construction and load thinking	Shared engineering vocabulary for heavy industrial cases when the buyer references HPE-class practice	Ignoring buyer-cited HPE or plant packing manuals while only meeting ISPM-15
VDI 2700 family (load securing practice)	Load securing on road vehicles; often cited next to CTU thinking for multi-modal chains	Securing is designed, not improvised, when cargo moves by truck before or after sea	Case designed for sea but destroyed on first road leg by inadequate vehicle securing
SOLAS VGM interface (shipper weight declaration)	Verified gross mass of packed containers under SOLAS requirements	Packed unit weights are known and declared correctly	Guessed package weights that break VGM and crane planning

No single product certificate replaces this stack. ISPM-15 timber does not dry the free air volume. Desiccant does not brace a machine. Barrier film does not make a skid load-rated. HPE or VDI references do not replace DIN desiccant sizing. Specify layers separately, then verify them on the dock. Always read the current official text for legal decisions.

Phytosanitary wood

ISPM-15: solid wood packaging material

ISPM-15 (International Standards for Phytosanitary Measures No. 15) is the global framework that regulates solid wood packaging material used in international trade. Its purpose is plant pest risk reduction, not structural strength and not corrosion control.

Lens	Detail
What it governs	Treatment and official marking of solid wood packaging material such as pallets, crates, boxes, skids, load boards and dunnage when used in international trade. National plant protection organisations implement the framework.
Buyer meaning	Wood packaging can be inspected and accepted at destination. The IPPC mark is the usual visual proof. Some routes and contracts also request treatment documentation in the shipping file.
Common failure if missed	Missing marks, illegible marks, untreated repair lumber, bark non-compliance, or solid wood members hidden inside mixed constructions. Delays and wood packaging measures fall on the shipment.

Heat treatment is the common commercial path under approved systems.

Marks must stay legible after paint, weather and handling.

Repair wood is still wood packaging material. Scrap lumber fails audits.

Plywood and engineered panels may follow different scope logic; solid wood inserts still need compliant handling.

Full buyer guide: ISPM-15 export packaging guide (includes IPPC stamp anatomy). Treatment choice: heat treatment vs fumigation for ISPM-15. Product paths: export wooden box and crate manufacturer Â· wooden / plywood boxes and pallets.

Moisture control standards language

DIN 55473 desiccant units (and DIN 55474 context)

Industrial packaging desiccants are specified with unit-based language so engineers can size bags to free air volume, film permeability, hygroscopic materials and voyage duration. DIN 55473 is the widely referenced German standard for packaging desiccants using the desiccant unit concept. Buyers use it to stop RFQs that only say â€œput some silica gel in the box.â€

Lens	Detail
What DIN 55473 governs	How packaging desiccants are described and tested around a desiccant unit definition, so quantity and performance can be compared and calculated rather than improvised.
Buyer meaning	Moisture control inside a sealed barrier is engineered. Bag size, placement and total unit load are part of the packing instruction, not tribal knowledge.
Common failure if missed	Too few bags for free volume; bags left outside the barrier; wet cargo sealed in; hygroscopic timber or cardboard ignored; long tropical routes treated like short dry runs.

DIN 55474 context (careful commercial language)

DIN 55474 appears in industry conversation next to unit-based desiccant sizing practice for packaging. Treat it as related standards language for how desiccant quantities are discussed and calculated in packaging work, not as a magic formula that replaces engineering judgement. For container-level hanging desiccants (calcium chloride systems that collect liquid water for whole-unit climate control), use product capacity, route humidity and free container air volume as the design drivers, and keep package-level DIN unit desiccant as a separate layer inside the barrier envelope. Do not claim a DIN number as a substitute for route-specific sizing records.

Related products and physics: industrial desiccants Â· container desiccant Â· container rain Â· desiccant vs VCI Â· DIN 55473 desiccant standard.

Wooden case construction

ASTM D6251 and D6039 style boxes and crates

When buyers want more than â€œheavy timber,â€ they often call for wooden shipping boxes and open crates in the commercial tradition of ASTM D6251 (wooden boxes) and ASTM D6039 (crates and similar open constructions). In export RFQs these appear as style or class language that defines panel construction, base design and intended service. This page uses common commercial reference language only. Always match the buyerâ€™s called-out style, class and current standard edition; do not invent clause numbers in packing certificates.

Lens	Detail
What they govern (commercial use)	Construction patterns for wooden boxes and crates: when a closed box is appropriate, when an open crate is appropriate, and how base, sheathing and framing are expected to behave under shipping loads.
Buyer meaning	Structure is specified by recognised shipping-box language rather than local custom only. Weight class, content mass and handling method drive timber selection and joinery discipline.
Common failure if missed	Guessed skid sizes under multi-tonne machines; open crates used where weather exposure needs a closed box; closed boxes without ventilation or barrier plan; lift geometry ignored.

Box vs crate is a decision

Closed wooden or plywood boxes protect against weather and handling abuse. Open crates save weight and improve visibility when cargo is already weather-protected or when ventilation is preferred. Decision guide: wooden crate vs box for export.

ISPM-15 is not a strength rating

An ISPM-15 mark proves phytosanitary treatment of solid wood packaging material. It does not certify that a base will survive a crane lift. Size structure to mass, centre of gravity and dynamic loads.

Anchor into structure

Bolt machines through mounting points into a load-rated skid. Sheet metal skins and painted surfaces are not anchor planes.

Document the style callout

When an RFQ cites ASTM box or crate language, echo the called-out style or class in the packing method note so QA and receiving can compare apples to apples.

Moisture envelopes

Barrier materials and MIL-PRF-131 class language

A sealed moisture envelope is how desiccant does useful work. Without a low-permeability barrier, ambient humidity equalises and unit bags only delay the problem. Commercial export packs often describe barrier laminates using performance-family language associated with MIL-PRF-131 class flexible barrier materials: multi-layer constructions (commonly foil-containing) intended for long sealed protection of sensitive metal and dry goods. Use that language carefully. It is a performance family reference for barrier film and bag constructions, not a free-standing claim that every bag on the market is â€œmilitary certified,â€ and not a substitute for grade-specific data sheets.

Lens	Detail
What it governs (commercial practice)	Flexible barrier laminate performance expectations for sealed packaging envelopes: low water vapour transmission, heat-seal integrity and handling toughness appropriate to industrial packing.
Buyer meaning	Critical free volume around cargo is enclosed so humidity can be controlled with desiccant and so corrosion systems (including VCI) work inside a defined atmosphere.
Common failure if missed	Using thin stretch film or ordinary poly as â€œbarrierâ€; poor heat seals; punctures at sharp edges; leaving desiccant outside the bag; sealing wet surfaces.

MIL-STD packaging practice (buyer may reference)

Some defence-adjacent and high-value commercial buyers reference military packaging method, level and preservation practice (often under MIL-STD packaging language) as a structure for how to clean, dry, preserve and unit-pack items. That is a method callout, not automatic certification of a civilian export crate. If a buyer requires a military packaging method, write the exact method and level they specify, verify materials against their acceptance rules, and do not market a commercial seaworthy pack as â€œMIL certifiedâ€ without a real contractual basis.

Barrier and corrosion product paths: vacuum and aluminium barrier packing Â· aluminium vacuum barrier film Â· VCI packaging Â· VCI film Â· VCI paper. European plant manuals often also cite DIN climate classes and association packaging practice (for example HPE-class construction thinking). Treat those as buyer callouts to match, not as automatic certificates of a civilian export pack.

Container and unit packing

CTU Code: packing cargo transport units

The CTU Code (Code of Practice for Packing of Cargo Transport Units), jointly associated with IMO, ILO and UNECE, is the international good-practice framework for packing and securing cargo in containers and other cargo transport units. It sits above the individual case: even a perfect machine pack can fail if the unit is loaded badly, overloaded in one corner, or left free to move under ship motion.

Lens	Detail
What it governs	Planning, packing, securing, marking and documentation practices for CTUs so cargo remains safe for people, the unit and other cargo through the transport chain.
Buyer meaning	Mass distribution, blocking, bracing, lashing and load planning are professional. Dangerous goods, when present, follow their own additional rules; general cargo still needs restraint discipline.
Common failure if missed	Cargo shift, broken case walls, container door pressure, crushed neighbouring freight, injury risk at unpack, and difficult insurance conversations after an incident.

Plan mass and centre of gravity of the packed unit, not only of each machine.

Block and brace so packages cannot walk under pitch and roll.

Protect void spaces that invite tipping or sliding.

Respect declared weights and container ratings.

Record packing when the commercial file or carrier process requires it.

Separate case design from unit packing design; both must pass.

The CTU Code is good-practice guidance used widely in professional packing. It is not a substitute for carrier instructions, local safety law or dangerous goods regulations. Use competent packers for heavy and high-value loads.

Handling communication

ISO 780 handling marks and pictograms

ISO 780 defines pictorial symbols for the handling of packages. In export practice those symbols tell warehouse and terminal crews how to lift, stack, protect from rain and keep orientation without relying on a single language. They complement, rather than replace, stencilled gross weight, centre of gravity and sling or forklift point marks.

Lens	Detail
What it governs	Standardised handling pictograms for packages in the logistics chain.
Buyer meaning	Receiving docks and ports understand care instructions at a glance. Risk of inverted or mishandled cases falls.
Common failure if missed	Crews invent lifts; cases tip; fragile tops take forklift hits; â€œthis side upâ€ is only written in one language and ignored.

Always pair symbols with numbers

Stencil gross weight, dimensions and centre of gravity. Symbols alone do not tell a crane crew the mass of a 12-tonne skid.

Mark real lift points

Show approved sling and forklift positions that match the engineered base. Wrong lifts break good timber.

Keep marks durable

Weather, abrasion and wrapping can erase ink. Use durable stencil or plate methods on exterior faces.

Match packing list case IDs

External case numbers must match the packing list and commercial invoice line logic so customs and goods-in can reconcile. Full guide: export packing list guide. Symbol depth: ISO 780 packaging symbols guide.

Contract and insurance practice

Seaworthy packing and â€œadequate packing for the voyageâ€

In marine cargo practice, packing that is inadequate for the known risks of the voyage can complicate or undermine claims. Carriers and insurers care whether the shipper took reasonable steps to protect the cargo against ordinary ocean hazards: handling shock, ship motion, humidity cycling, salt air and stowage forces. That is why professional exporters treat â€œseaworthy packagingâ€ as a written specification, not a dock-side improvisation.

Lens	Detail
What it governs (practice, not legal advice)	Commercial expectation that packaging is suitable for the intended voyage mode, duration and climate exposure. Exact policy wording varies by insurer and contract.
Buyer meaning	Structure, moisture control, corrosion control, restraint, marking and documents form a defensible pack story if something goes wrong.
Common failure if missed	Domestic crates used for ocean; free water sealed in; no barrier on bright metal; loose axes; missing wood marks; no packing method note when audited later.

Not legal advice

This page explains engineering and commercial practice. It does not interpret any insurance policy, Incoterms allocation or court decision. For claim or contract decisions, use your insurer, broker and counsel. What packaging engineers can do is document a complete system: materials, quantities, marks and photos at close.

Foundations: what is seaworthy packaging Â· seaworthy packaging system layers Â· risk education: insufficient packing and marine cargo claims.

Pre-shipment

Export packing pre-shipment checklist

Run this checklist as independent layers. A green light on wood does not clear moisture. A sealed barrier does not clear unit stowage. Sign off each block before the container or flat-rack leaves the packing bay.

1. Metal and corrosion layer

Surfaces dry and clean: free of coolant, swarf, fingerprints where critical, and free water.

Corrosion method applied: VCI film, paper, emitters or approved rust preventive as specified for metal type and duration.

VCI and oil not fighting each other: follow product guidance; do not assume every oil is VCI-compatible.

Cavities addressed: cabinets, gearboxes, tubes and hollows have emitters or local protection when required.

Bright metal contact protected: no bare steel against untreated cardboard or damp timber.

2. Moisture and barrier layer

Barrier grade correct: low-permeability bag or liner for the sealed free volume (not ordinary stretch film alone).

Heat seals continuous: no open corners; edge protectors at sharp points.

Desiccant sized in units: DIN 55473 unit thinking for package free volume, film and voyage; records kept.

Desiccant inside the barrier: bags placed before final seal, not taped outside for show.

Hygroscopic materials considered: wet wood, wet packing paper and open cartons do not share the sealed envelope unplanned.

Container-level desiccant planned when whole-unit climate threatens mixed cargo: container desiccant.

3. Structure and immobilisation layer

Mass and centre of gravity known: base designed to static and dynamic loads, not guessed.

Mounting points used: machine bolted or clamped into skid structure through intended points.

Axes locked: slides, turrets, booms, doors and rotating parts immobilised for transit.

Box or crate style matches exposure: closed vs open deliberate; weather and handling considered.

ASTM or buyer style callout echoed when the RFQ required it.

Edge and corner protection where barriers and panels meet sharp geometry.

4. Wood and phytosanitary layer

All solid wood packaging material ISPM-15 treated and marked.

Marks legible on pallets, crates, boxes, skids and dunnage that travel with the cargo.

No untreated repair lumber in field fixes.

Bark and construction rules respected for the material system used.

Solid wood members on plywood assemblies audited separately.

Treatment documents filed when buyer or route requests them.

5. Marks and identification layer

ISO 780 handling pictograms applied where relevant.

Gross weight, net weight and dimensions stencilled or labelled.

Centre of gravity and lift / sling / forklift points marked to match engineering.

Case numbers match packing list and commercial paperwork.

Fragile, keep dry, this side up and other care marks consistent with real risks.

Destination and shipper marks per buyer and carrier instruction.

6. Document layer

Packing list complete with serials where required.

Packing method note covers structure, moisture, corrosion and wood compliance.

Photos at critical stages (before barrier close, after close, after case close) when claims risk is high.

Certificates collected: timber treatment, material data sheets, VCI grade papers when the RFQ asks.

Dangerous goods paperwork separate and complete when applicable.

7. Stowage and CTU layer

Load plan agrees mass distribution with container or flat-rack limits.

Blocking, bracing and lashing prevent shift under pitch and roll.

Doors and voids do not leave heavy packages free to walk.

Container rain risk addressed for tropical and mixed-climate routes (hanging desiccant, dry packing, barrier integrity).

CTU packing records completed when process requires them.

Final visual: no loose dunnage, tools or scrap left to become projectiles.

Step-by-step machine procedure that implements these layers: how to pack a machine for export. Service execution: export packing services Â· heavy machinery packaging Â· on-site packing and crating.

Roles

Who checks what in the export chain

Different parties look at different layers. Design the pack so each inspector finds what they need without opening the cargo.

Party	Primary focus	What they look for
Shipper / packing QA	Full system	Specification compliance: metal dry, VCI or oil applied, barrier sealed, desiccant units correct, structure load-rated, ISPM-15 marks, case IDs, photos, packing list
Customs and phytosanitary authorities	Wood and documentation	ISPM-15 marks and treatment legitimacy; commercial and packing documents; prohibited materials; sometimes treatment certificates
Carrier / terminal	Handling and unit safety	Declared weights and dimensions; liftability; obvious packaging defects; CTU packing integrity; dangerous goods marks when applicable
Marine cargo insurer / surveyor	Adequacy for voyage	Whether packing was reasonable for known ocean risks; method notes; photos; evidence of moisture and corrosion control on high-value metal cargo
Buyer goods-in	Receipt condition and install readiness	Case integrity, packing list accuracy, corrosion-free metal, correct serials, ease of unpack, residual preservatives that affect assembly
Freight forwarder / packing contractor	Execution interface	RFQ completeness, site access, lift plan, material callouts, schedule gates before vessel cut-off

No single stamp satisfies all parties. Phytosanitary clearance is not a corrosion certificate. A clean insurance photo set is not a substitute for CTU restraint. Build the pack for every gate that will actually inspect it.

Shipping file

Document pack list for export packing

Keep a shipping file that can answer an auditor six months later. Minimum commercial set plus packaging evidence:

Document	Why it matters
Packing list	Case-by-case contents, serials, quantities; customs and goods-in reconciliation
Commercial invoice / packing note references	Trade and valuation alignment with physical cases
Packing method / specification sheet	Records structure, barrier, desiccant units, VCI or oil, wood standard, marks
ISPM-15 treatment evidence	When mark alone is not enough for the buyer or route; file certificates if issued
Material data / grade papers	Barrier, desiccant and VCI grades called in the RFQ
Weight and dimension sheet	Carrier booking, crane planning, CTU load planning
Lift and centre-of-gravity sketch	Safe handling instruction for terminals
Photo set	Pre-wrap metal condition, desiccant placement, seal, closed case, loaded unit
CTU packing record	When process or carrier requires unit packing documentation
Dangerous goods documents	Only when applicable; keep separate and complete

Route intensity (climate only)

Why voyage climate changes the checklist intensity

Standards names stay the same. Desiccant units, barrier discipline and container-level moisture control scale with climate intensity and dwell time. Use subtle lane thinking for humidity and temperature cycling, not for marketing destinations.

Climate intensity band	Illustrative lane character	Checklist emphasis
High humidity cycling	Tropical and equatorial ocean legs with strong day-night container roof cycles (for example Singapore, Port Klang, Ho Chi Minh, Santos, West Africa calls)	Barrier integrity, high desiccant unit load, container hanging desiccant, dry wood and dry metal before seal
Mixed temperate to humid	North Europe and North America export legs with variable seasons (for example Rotterdam, Hamburg, Houston, New York corridor character)	Standard DIN unit sizing with season-aware free volume; still seal critical metal; do not assume â€œcool climate equals dry cargoâ€
Hot dry then marine re-humidify	Middle East and desert-to-port transitions (for example Jebel Ali, Dammam corridor character) where cargo can heat, then meet humid marine air	Do not pack hot wet metal; allow temperature equalisation; protect against condensation when the container cools at sea
Long dwell / storage plus sea	Any port or yard storage before or after the voyage	Treat duration as cumulative; mothball-grade preservation if storage is long: machinery mothballing

Deep dive on condensation: container rain. Case narrative: stopping container rain on ocean freight.

Related guides

Seaworthy knowledge cluster

This page is informative standards and checklist content from a global export packaging manufacturer that builds complete seaworthy systems (structure, VCI corrosion control, desiccant, barrier, marking and documentation). It is educational, not legal advice and not a substitute for the official text of ISPM-15, DIN standards, ASTM standards, the CTU Code, ISO 780 or any insurance policy.

Frequently asked

Export packing standards and checklist FAQs

What standards apply to export packing for ocean freight?

Typical stacks combine ISPM-15 for solid wood packaging material, DIN 55473 desiccant unit practice for in-pack moisture control, barrier performance language for sealed envelopes, ASTM-style wooden box or crate construction language when buyers require it, CTU Code practice for packing and restraining cargo transport units, and ISO 780 handling marks. Insurance and sales contracts may also require packing that is adequate for the voyage.

Is ISPM-15 the same as seaworthy packing?

No. ISPM-15 is a phytosanitary standard for solid wood packaging material. Seaworthy packing also covers structure sizing, corrosion control, moisture barriers, desiccant, restraint, marks and documentation. See the ISPM-15 export packaging guide and what is seaworthy packaging for the full split.

What is DIN 55473 in export packaging?

DIN 55473 is the widely referenced German standard for packaging desiccants based on the desiccant unit concept. It lets engineers specify and size bagged desiccants for sealed free volume instead of guessing bag counts. It does not replace container-level hanging desiccant design for whole-unit climate control.

What is the CTU Code for packing?

The CTU Code is the IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units. It addresses how cargo should be planned, packed, secured and documented in containers and similar units so loads remain safe through transport. It is separate from individual case design.

Do wooden export crates need ASTM D6251 or D6039?

Only when the buyer or specification calls for that construction language or an equivalent class system. Many commercial packs use internal engineering standards that align with the same ideas. When ASTM style or class is called out, document it and design the base to real mass and lift method.

What does MIL-PRF-131 mean for export barrier bags?

In commercial packing it is often used as performance-family language for flexible barrier laminates suitable for sealed moisture protection. Specify grade data sheets for the actual film or bag. Do not treat a casual â€œMIL styleâ€ label as proof without material documentation.

What should be on an export packing pre-shipment checklist?

Check metal cleanliness and corrosion protection; barrier seal and desiccant units; structural immobilisation and case design; ISPM-15 wood marks; ISO 780 and weight/lift marks; document pack completeness; and CTU stowage/restraint before the unit leaves. Sign off each layer separately.

Who inspects export packing at destination?

Phytosanitary and customs officers focus on wood compliance and documents. Carriers care about weight, handling and unit safety. Insurers and surveyors may review adequacy after a loss. Buyer goods-in judges receipt condition, packing list accuracy and unpack readiness.

What documents should travel with a seaworthy pack?

At minimum a packing list, weight and dimension data, and packing method notes. Add ISPM-15 treatment evidence when requested, material grade papers for barrier/desiccant/VCI when specified, lift/CG sketches for heavy cases, photo sets for high-value cargo, and CTU packing records when process requires them.

Does ISO 780 replace stencilled weight marks?

No. ISO 780 provides handling pictograms. Crews still need numeric gross weight, dimensions, centre of gravity and approved lift points. Use both systems together.

Can domestic packing be used for ocean export if the container seals well?

Usually no. A sealed container still cycles temperature and humidity (container rain), still experiences ship motion, and still faces phytosanitary rules for solid wood. Domestic packs typically lack the moisture, corrosion and wood compliance stack ocean transit needs.

Is this checklist legal or insurance advice?

No. It is technical and commercial practice guidance for engineers and packing teams. Contract, Incoterms and insurance decisions belong with your commercial, legal and insurance advisors. Document your actual packing method so those advisors have facts if a claim arises.

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