Pallet and Container Loading for Knit Bags: Cube, Stack Height, Pallet Footprint and the Floor-Loaded Alternative

How Many Cartons Actually Fit: The Cube Calculation

A 40ft high-cube container holds about 610 cartons of knitted bags floor-loaded, and that number comes from usable cube rather than from the nominal 76 cubic metres, because a carton will not tile a container exactly.

The arithmetic runs in three steps. A standard knit carton is 60 x 40 x 40 cm, which is 0.096 cubic metres. A 40ft high-cube has about 76 cubic metres of nominal internal volume. Dividing gives roughly 790 cartons, and no loading plan ever achieves that because cartons do not tile perfectly around the door recess, the corrugation at the walls and the air gap at the roof. A practical loading factor of about 78% is realistic for hand-loaded cartons of this size, which puts the achievable figure near 610. A 20ft general purpose container at about 33 cubic metres works out near 260 cartons at the same factor.

The number that matters commercially is what that means in pieces. At about 200 knit totes per carton, 610 cartons is roughly 122,000 pieces in a 40ft high-cube, and about 52,000 pieces in a 20ft general purpose container. Those are the figures a buyer needs when deciding whether to consolidate two colourways into one container or ship them separately, because consolidation usually saves more than any packaging redesign.

Palletised or Floor-Loaded: Which Wins on Knit Freight?

Floor-loading wins on units by about 50% and palletising wins on handling time and damage, and the decision turns on what the destination does with the container when it arrives.

The 50% figure is the one that surprises buyers. It comes from the pallet itself: a 1200 x 1000 mm pallet takes a 1200 x 1000 mm footprint plus about 145 mm of height, and twenty of them consume roughly 85% of the container floor while their footprint wastes the gaps between them. Cartons stacked directly on the container floor use every millimetre. Where the destination has a forklift and a cross-dock, palletising is almost always right. Where it has a team with a hand truck, floor-loading is the only option that arrives intact.

What Limits a Knit Bag Container: Cube or Weight?

Cube, almost without exception: a 40ft high-cube of knitted bag cartons weighs under 5,000 kg against a payload of roughly 26,500 kg, so the container is full long before it is heavy.

That is unusual and it is worth exploiting. Most general cargo hits the weight limit first and ships air; knit ships air in the literal sense. A carton of 200 knit totes at 12 kg gross means 610 cartons is about 7,300 kg of cartons plus perhaps 300 kg of pallets, which is roughly a quarter of the container's payload allowance. The practical consequence is that a knit bag programme can always take the largest container available rather than being forced into a smaller one by weight, and it can consolidate multiple styles and colourways into one booking without worrying about axle limits.

It also means volumetric weight is the relevant number on air freight, not actual weight. Air cargo is charged on the greater of actual weight and volumetric weight, calculated as length x width x height in centimetres divided by 6,000. A 60 x 40 x 40 cm carton is 16 kg volumetric against 12 kg actual, so air freight on knit bags is billed at about 133% of the scale weight. For a knitted bag that compresses to about 40% of its stuffed volume, compressing harder before packing is one of the few levers that reduces freight on both modes.

How High Can a Pallet Be Stacked Before It Crushes?

Six layers of 400 mm cartons on a pallet fits a 40ft high-cube, and the carton at the bottom of that stack carries about 60 kg, which is well inside the capability of a single-wall carton with an edge crush value near 4.5 kN/m but not inside the capability of the same carton after a humid voyage.

The calculation is the compression one from ISO 12048 and matters because of time, not height. The bottom carton in a six-high stack carries the weight of five cartons above it, about 60 kg, spread over its perimeter. A corrugated board loses strength as it absorbs moisture, and a container crossing an equator can sit above 80% relative humidity for several days. The standard practice is to specify a board that retains enough edge crush at high humidity for the intended stack, and to treat the safety factor as covering humidity rather than covering stacking error.

Standard carton

60 x 40 x 40 cm, 0.096 cubic metres, 12 kg gross limit

Cartons per pallet layer

4, on a 1200 x 1000 mm pallet

Layers in a 40ft high-cube

6, giving 24 cartons per pallet

Layers in a 40ft standard

5, giving 20 cartons per pallet

Bottom carton load

About 60 kg over five layers above it

Board

Single-wall B-flute, about 2.8 mm, edge crush near 4.5 kN/m

Pallet footprint

1200 x 1000 mm for a 40ft, 1200 x 800 mm Euro for EU delivery

Pallet treatment

ISPM 15 heat treatment with the IPPC mark visible

Which Pallet Footprint Suits a 40ft Container?

A 1200 x 1000 mm pallet gives 20 pallets in a 40ft container and a 1200 x 800 mm Euro pallet gives about 23, and the Euro footprint wins on count while the 1000 mm footprint wins on carton fit.

The reason is the carton dimension. A 600 mm carton side divides cleanly into 1200 mm and a 400 mm side divides cleanly into both 800 mm and 1000 mm with waste. On a 1200 x 1000 pallet the best arrangement is two cartons along the 1200 side and two along the 1000 side, giving four cartons per layer at 94% footprint coverage. On a 1200 x 800 Euro pallet the arrangement is two by two again but the pallet is smaller, so more pallets fit and fewer cartons fit per pallet. Which is better depends entirely on whether the destination runs Euro racking, which is the rule in most of continental Europe, or GMA racking, which is the rule in North America.

What the Load Has to Survive: ISTA 3A and Stack Load

A parcel-level knitted bag shipment is tested to ISTA 3A, which sets drop heights by weight: about 460 mm for a package up to 9.5 kg, about 380 mm for 9.5 to 18.6 kg, and about 300 mm for 18.6 to 27.7 kg, with the number of drops and the sequence set by the procedure.

ISTA 3A is a parcel procedure and applies where individual cartons move through a parcel network rather than as a full container load. A full container load of knit bags is not dropped; it is compressed and vibrated. The relevant tests there are ISO 12048 for compression and ISO 2234 for stacking under a static load. The practical specification that follows from both is the same: the carton has to hold its stack height in a humid container for the full voyage, and the closure has to hold when the bottom carton in a six-high stack is lifted by its edges.

For a knit programme the drop test has an unusual outcome worth knowing. A knitted bag compresses on impact and absorbs energy that a rigid carton would transmit to its contents, so knit cartons frequently pass a 460 mm drop with no damage to the bag at all and fail instead on the carton closure or on a crushed corner. Testing the closure rather than the contents is the useful focus here.

A Load Plan Buyers Can Check Before Booking

A load plan is five numbers and a drawing: carton dimensions, cartons per pallet, pallets per container, total cartons and total pieces, plus a sketch showing the orientation of the cartons on the pallet.

• Carton dimensions in cm and the gross weight limit in kg, stated together.
• Cartons per pallet layer, with the orientation that produces it.
• Layers per pallet and the resulting loaded pallet height in mm.
• Pallets per container for the container type actually booked, not a generic figure.
• Total cartons and total pieces, reconciled with the packing list.
• Total gross weight against the container payload, to confirm cube is the binding limit.
• The pallet footprint and the ISPM 15 treatment mark the destination requires.

The reconciliation at the end is the part that prevents the expensive failure. A load plan that says 610 cartons while the packing list says 604 produces a container that is short at the destination, and because the cartons are all sealed and stacked, finding the six missing ones means unloading the container. Reconcile the load plan, the packing list and the AQL 2.5 inspection report (ISO 2859-1) before the container is sealed.

Where Loading Sits in the Delivery Schedule

The load plan is drawn during the 30-day bulk production window, once the pack plan and the carton count are known, and booking follows it rather than preceding it.

Booking before the count is known is the single most common cause of a container that is partly empty or a shipment that splits across two containers. The pack plan settles pieces per carton, packing produces the carton count, the load plan converts that count into a container type and a booking, and the inspection report confirms the count before sealing. On a knit programme at a MOQ of 100 pcs per style and colourway, a multi-colourway order is exactly the case where the count moves during packing, which is why the booking waits. Shipments leave FOB Xiamen, with CIF and DDP available.

Frequently Asked Questions

People Also Ask

Cube Is the Constraint, So Plan the Arrangement First

A knit bag container is never heavy enough to be limited by weight, which means every decision in the load plan is about arrangement. Pallet footprint, carton orientation and whether to palletise at all move the piece count by tens of thousands of units on the same booking.

Draw the plan after the carton count is known, reconcile it against the packing list, and the container seals once. For the carton the plan is built on, see carton specification for bag shipping. For the documents that accompany it, see export documentation for bag shipments.