Bulky packaging materials can be limited by available space rather than payload, but the result depends on the actual product, bundle dimensions and weight. Build a loading plan against the assigned container, cargo securing requirements and road limits instead of assuming a standard sheet tonnage.
The dimensions to plan against
Internal dimensions, approximate and varying slightly by container:
- 20 ft: 5.90 × 2.35 × 2.39 m — about 33 m³
- 40 ft: 12.03 × 2.35 × 2.39 m — about 67 m³
- 40 ft high cube: 12.03 × 2.35 × 2.69 m — about 76 m³
Door opening is narrower and lower than the internal section — usually around 2.34 m wide and 2.28 m high on a standard 40 ft, more on a high cube. Anything that fits the interior but not the doorway cannot be loaded, and this catches oversized pallets regularly.
Using the illustrative 2.35 m internal width above, neither a 2,440 mm sheet nor a 2,400 mm sheet fits flat across that width: they exceed it by 90 mm and 50 mm respectively. Orient the long dimension along the container length, then check the bundle’s other dimension, packaging overhang, loading equipment and actual door opening. Do not assume reducing a sheet by 40 mm makes it fit crosswise.
Confirm the customer’s usable sheet dimensions and the complete loading layout before cutting production material. A dimension change needs buyer approval and a demonstrated loading benefit.
Palletised or floor loaded
Floor loading may avoid pallet height and some gaps, but compare actual layouts and handling methods before assuming a gain. Confirm loading and unloading labour, edge protection, cargo securing and the consignee’s equipment.
Palletised loading is faster at both ends, protects edges, and allows mechanical handling. It costs you volume and the pallets themselves.
The decision usually comes down to labour cost at destination. If unloading is mechanised or labour is expensive, palletise. For high-value-per-cubic-metre goods where freight dominates, floor load and accept the handling.
If palletising, state the orientation on the layout. Two 1,200 × 1,000 mm pallets with their 1,200 mm sides across the container require 2,400 mm and do not fit an illustrative 2,350 mm width. Rotate them so their 1,000 mm sides are across the width and the nominal pair requires 2,000 mm; still check cargo overhang, handling clearance and the resulting lengthwise layout. Pallet dimensions alone do not establish the loaded cargo footprint.
Protecting edges
Hollow sheet damage in transit is almost entirely edge crushing. The flutes are open at the cut edges and a strap tensioned directly across them will collapse the structure.
Use edge protectors under every strap. Cardboard angle is cheap and adequate; plastic angle survives multiple uses. Strap tension should hold the bundle stable, not compress it — over-tensioned strapping is a leading cause of damage, and it is usually applied with good intentions.
Bundle sheets in consistent counts with the flutes running the same direction throughout. Mixed orientation within a bundle creates uneven load paths and localised crushing.
Leave a gap of a few centimetres at the container doors. Cargo pressed against the doors shifts during transit and can jam them shut or fall out on opening.
Weight distribution
Even with a light load, distribute weight along the container length. Concentrating heavy items over the rear axle creates an axle-weight violation on road haulage even when the total gross weight is legal — this stops trucks at weighbridges and causes expensive delays.
On mixed loads, heavy items go on the floor, evenly spread. Light bulky items go on top. Sounds obvious; gets ignored on mixed packaging orders where PE pipe coils and hollow sheet ship together.
Working out how much fits
Calculate discrete rows, columns and stack levels from the actual protected bundle dimensions. Check doorway access, pallet height, gaps, permitted stacking, weight distribution and securing equipment. Nominal cubic volume is only an upper bound; do not apply a universal packing-efficiency percentage.
Illustrative arithmetic only: 100 sheets of 2,400 × 1,200 × 4 mm have a theoretical bare stack height of 0.400 m. Its unprotected bounding volume is 2.4 × 1.2 × 0.4 = 1.152 m³. At an assumed 800 g/m², the bare sheet weight is 2.4 × 1.2 × 0.8 = 2.304 kg, or 230.4 kg per 100-sheet bundle. Packaging adds size and weight. Dividing a container’s nominal volume by 1.152 does not prove that number of bundles can be loaded: the row arrangement, orientation, door clearance, safe stack height and payload must all pass separately.
Ask the supplier and forwarder to confirm a dimensioned loading plan before production, including orientation, protected bundle sizes, count, stacking and weight. Obtain buyer approval before changing sheet dimensions.
Documents and pallet treatment
Check the destination rules for regulated wood packaging. Where ISPM 15 applies, use an approved treatment and valid mark for the relevant wood packaging; heat treatment is not the only approved option. Some processed-wood materials are exempt. Plastic pallets avoid the raw-wood treatment requirement but still need to meet cargo, hygiene and destination requirements.
Packing list should state bundle count, sheets per bundle, bundle dimensions and weight, and total volume — the same figures the forwarder needs for the bill of lading and the destination agent needs for planning unloading.
We coordinate loading plans with third-party forwarders rather than operating freight ourselves. Send us your order list and destination port and we will produce a loading plan and tell you whether a dimension change would fit more into the same container.
Container and packaging references
The dimensions above are planning examples, not a booking specification. Request the assigned container’s internal and door dimensions, tare, permitted payload and plate details from the carrier. Check the IPPC standards register for ISPM 15 and the destination’s implementation requirements. Share your sheet or bundle dimensions, order quantity and destination to discuss the packaging specification.