Carton Packing and Container Loading Basics for Luggage Importers

By Weiye Chen (Ben) · Hongbin Luggage Buying Guide · Published October 28, 2026

When buyers negotiate, they usually focus on the case itself and forget the thing that carries it: the carton and the container. Ocean freight is charged by volume and weight. The carton decides how much volume each case takes, how high cartons can stack, and how much damage arrives at your warehouse. The carton is not packaging the factory happens to find — it decides how much freight every order takes and how much arrives damaged. This guide covers the basics: how a suitcase carton is built, how to work out the volume, how much a container holds, and what to watch when it is loaded.

What a suitcase carton looks like

Export suitcases usually ship one case per carton. A 3-piece set is different: the 20-inch case nests inside the 24-inch, which nests inside the 28-inch, so three cases travel in a single carton. The carton is normally 5-ply corrugated board — thicker than the 3-ply board used for courier parcels — because it has to resist crushing and damp during weeks at sea. Foam corners or cardboard dividers sit between the carton wall and the case, so the shell does not rub and scratch in transit.

A carton is bigger than the case inside it by a few centimetres on every side, to leave room for cushioning and handling. For example, one of our nested 3-piece sets ships in a carton of 46 × 39 × 81 cm, about 0.145 CBM — three cases in the volume of a single 28-inch carton. Packed separately, the same three cases would need three cartons and roughly 2.5 times the total volume. Nesting saves more than the carton itself: it saves freight volume.

How volume is calculated: CBM is the language of ocean freight

Freight quotes and bookings are all done in cubic metres (CBM). The volume of one carton is simple: length × width × height, measured in metres. A carton of 46 × 39 × 81 cm is 0.46 × 0.39 × 0.81 = 0.145 CBM. The total volume of an order is the per-carton volume multiplied by the number of cartons: 100 cartons is 14.5 CBM.

Air freight adds a second concept: volumetric weight. A shipment that is large but light is charged by the volume it takes, converted into a weight by the carrier's divisor. Luggage is a classic volumetric cargo — a 28-inch case weighs only a few kilograms but takes up real space. Before you ask a forwarder for a freight quote, get the carton dimensions and gross weight for every style from the factory. Without carton data, a freight quote is meaningless.

How much fits in a container: the three standard box types

The three dry containers used for almost all luggage shipments have standard internal dimensions — they vary slightly by container age and manufacturer, so confirm with the carrier before booking:

Theoretical volume is not what you can actually load. Cartons are square, containers have door frames and corner posts, and you need space for loading access and bracing. Practical utilisation is usually 85–90%. Take a 40ft high cube: 76 CBM at 85% is about 65 CBM. At 0.145 CBM per carton, that is roughly 440 cartons of nested 3-piece sets. That is an estimate — the real number depends on how well the carton size matches the container: whether the carton width fills the 2.35 m container width neatly, and how many layers stack under the 2.69 m ceiling.

Luggage is a volume cargo, not a weight cargo: check volume first, weight second. A 40ft high cube can carry about 26,500 kg, but 440 cartons of nested sets weigh far less than half of that. Weight is never the bottleneck for luggage — volume is.

Seven things to watch when a container is loaded

1. Heavy cartons at the bottom, light ones on top. The bottom layer carries the most weight. Put heavy, large cartons low and light ones high, or the bottom cartons crush. Ask the factory for the carton compression strength: whether 5-ply board with a stated edge-crush value can take five or six layers — get the number, do not guess.

2. Cartons upright, arrows up. A suitcase stands upright inside its carton. Loading a carton upside down or on its side puts the weight on the wheels and the handle — and that is how wheels arrive bent and handles arrive jammed. Follow the printed up-arrows on the carton.

3. Do not stack above the door height. A 40ft high cube door is about 2.58 m high against 2.69 m inside. Leave about 10 cm of clearance so the door closes and the forklift can work. Cartons stacked to the ceiling get squeezed by the door frame, leaving pressure marks on the shell — and in the worst case the door will not close at all.

4. Leave room for bracing. The gaps between cartons and the container walls, and between the last row and the door, are filled with airbags or timber bracing. Unsecured cargo slides and crashes around at sea. Who supplies the bracing — the factory or the forwarder — should be agreed when you book.

5. Protect against moisture. A container at sea for weeks goes through day and night temperature swings, and condensation forms inside. Damp cartons soften and collapse, and the cases inside go mouldy. Desiccant inside the container and stretch film around the cartons are standard practice — and more important on hot, humid routes to the Middle East and Southeast Asia.

6. Shipping marks and labels must be right. Every carton carries a shipping mark: consignee, destination port, carton number, dimensions, gross weight and piece count. A wrong mark means the cargo does not match the customs paperwork on arrival. When one order has several colours and sizes, mark each carton with exactly what is inside, so the warehouse does not open the wrong one.

7. Pallets or floor-loaded — decide before you order. Floor loading stacks cartons straight into the container and gives the best volume use. Pallets make forklift loading and warehouse receiving easier, but the pallet itself takes height and volume, so fewer cartons fit. Retail chains and warehouses in Europe often require palletised delivery: confirm the pallet size (a Euro pallet is 120 × 80 cm) and the number of layers per pallet when you order. A 20ft container takes about 10–11 Euro pallets in a single layer; a 40ft takes about 23–25.

Full container or shared container: decide by volume

If your cargo fills a container, book a full container (FCL). One container, your cargo only: you control the loading, the sealing and the opening, and the risk of damage and loss is lowest. If your cargo does not fill a container, use a shared container (LCL): your cartons travel with other shippers' cargo, and you are charged per CBM, usually with a minimum chargeable volume. Work out the total CBM before you order: close to a full container, top it up to FCL; far short of one, go LCL. Shared cargo is unloaded and reloaded at transhipment ports, so every extra handling step adds damage risk — pack it stronger.

Pre-order checklist

Lead time

Sample and production lead times are confirmed per project — order size, customisation and the factory's schedule decide them. Ask the factory to confirm the loading plan and the lead time together when you place the order.