T-Shirt Packing Math: Units Per Carton, CBM and Freight Cost

Freight is the line in a t-shirt order that buyers feel last and control least, which is a pity, because of all the costs in an order it is the one most purely determined by decisions, and decisions can be revisited before they are invoiced, usually because the packing decisions that set it were made silently at the start. How many shirts go in a carton, how that carton is dimensioned, and how tightly the whole order packs decide the cubic metres you pay to move, and on a container-scale order the difference between careless and careful packing is measured in thousands of dollars. This guide does the math in the open, with worked examples an importer can reuse.

We pack and export t-shirts from Bangladesh for buyers in the USA, UK, Europe, Canada, Australia and the Middle East. The numbers below use typical tee weights and standard export cartons; your own program’s figures will vary with fabric weight and packing style, and the method matters more than any single example.

The Three Numbers That Decide T-Shirt Freight Cost

Everything in packing math reduces to three figures: the packed volume per piece, the gross weight per piece, and how your freight is charged. Sea freight on less-than-container loads is typically charged per cubic metre (CBM) or per tonne, whichever is greater; air freight uses volumetric weight, commonly (length x width x height in centimetres) divided by 6,000, charged per kilogram against whichever is heavier, actual or volumetric. A t-shirt is light and bulky relative to its weight, so volume almost always wins: tees are a volume cargo, and packing is a volume game.

Keep the three numbers visible from the start of any program: ask for the estimated units per carton, carton dimensions and gross weight with the quotation, and hold them in the order file next to the price. Suppliers who pack export orders daily produce these figures from memory of their own standards; a supplier who cannot estimate them has not thought about your freight, and you will pay for the thinking later.

Our Classic Crew-Neck T-Shirt at 180 GSM weighs roughly 200 to 230 grams per piece depending on size. The shirt itself is not the packing problem; the air folded inside it and the carton geometry around it are.

Units Per Carton: The Working Standards

The size run bends the average: a carton of XXL tees holds fewer pieces than a carton of S at the same fold, and a youth or kids program packs considerably more per box. Honest packing estimates are therefore given per size or per the order’s actual size ratio, and a single flat number quoted across a wide size range should be read as an approximation, useful for budgeting and wrong in detail.

Standard export cartons in this trade measure around 60 x 40 x 40 cm (0.096 CBM) or 60 x 40 x 30 cm for lighter programs. A mid-weight tee, individually polybagged and folded to a standard retail fold, packs at roughly 100 to 120 pieces per 60x40x40 carton in a solid size or ratio pack; heavyweight tees at 220 GSM and above pack closer to 80 to 100; lightweight promotional tees can run 130 or more. The gross weight of that carton lands around 24 to 28 kilograms, near the practical handling limit for a single carton, which is one reason the standard box is the size it is.

The folding method moves these numbers more than buyers expect. A tight machine-consistent fold with air pressed out can add 10 to 15 percent more units per carton against a loose hand fold, and vacuum or compression packing (used mainly for bulky fleece and hoodies) goes further. For tees, the honest lever is consistency: the same fold, the same polybag, no wasted headroom above the top layer.

Worked Example: 10,000 Mid-Weight Tees by Sea

Take 10,000 pieces of a 180 GSM tee at 110 pieces per carton: that is 91 cartons. At 0.096 CBM per carton the order measures 8.74 CBM. Gross weight at about 26 kg per carton is roughly 2,370 kg. On an LCL sea rate quoted per CBM, you are paying for 8.74 cubic metres; the weight (2.4 tonnes against 8.74 CBM) does not govern. Now tighten the packing to 125 pieces per carton through consistent folding: 80 cartons, 7.68 CBM, and the freight saving on the same rate is about 12 percent, achieved without changing the garment at all. This is why packing specifications belong in the purchase order conversation, not in an email after production.

A second example at the small end makes the same point in reverse: a 1,200-piece minimum order at 110 per carton is 11 cartons and barely over 1 CBM, so its freight is trivial beside the garment cost, and packing optimisation only starts paying real money as volumes climb toward container fractions. Knowing which regime your order sits in stops you over-engineering the small ones and under-engineering the large.

Scale the same order to a full 20-foot container (roughly 33 CBM usable) and it swallows the whole program three times over; at that point the question flips from cost per CBM to consolidation: combining styles and programs into one container through our market area export scheduling is where the real per-piece savings sit.

Carton Sizes and Palletisation

The 60 x 40 footprint is standard because it tessellates: it tiles neatly on both metric and export pallets and stacks stably in a container. Heights vary with the program (30, 40 or 50 cm) and the CBM per carton follows directly: 0.072, 0.096 and 0.120 respectively. Mixing carton sizes inside one order is sometimes unavoidable (a heavy size run in shorter boxes for weight), but every odd size complicates stacking and invites crushed corners; the fewer the variants, the denser and safer the stow. Where shipments move palletised, the pallet adds its own volume and the stack height limit (usually set by carton crush strength) caps the density gained, which is why the packing list states both carton CBM and the palletised total when pallets are used.

Carton strength is part of the math too. A carton loaded to 28 kg and stacked six high at the bottom of a container carries real weight for six to ten weeks; the board grade that survives that costs slightly more per box and saves its price the first time a cheaper box gives way mid-voyage and the insurer asks questions. Density pursued past the carton’s strength is false economy measured in damaged garments.

Ratio Packs Versus Solid Packs: The Hidden Variable

How sizes and colours are distributed inside cartons changes both the count and the downstream cost. A solid pack (one size, one colour per carton) maximises units per carton and simplifies factory packing, but the receiving warehouse must pick and mix for every store or customer order. A ratio pack (the selling ratio of sizes pre-packed in each carton) ships slightly less densely and adds packing labour, yet arrives ready to forward whole cartons to stores. Neither is universally cheaper; the freight saving of solid packs can be spent again in warehouse handling. Decide from your distribution model, and write the decision into the order, because the default a factory chooses will be its own convenience.

Polybag choices sit in the same conversation: individual bags are the retail standard and protect the garment; bulk folding several pieces per bag packs denser and suits promotional distribution where shirts are handed out, not shelved. The environmental and cost sides of that choice are covered by your market’s packaging rules, which several of our destination markets now regulate; agree the bag specification as carefully as the count.

Air Freight: When the Math Changes

Air freight punishes volume directly. The same 60 x 40 x 40 carton has a volumetric weight of 16 kg (60 x 40 x 40 / 6,000) while its actual gross weight is 26 kg, so tees by air are charged on actual weight, unusual for apparel and a small mercy. Bulky low-weight garments (hoodies, fleece) flip the other way and pay for air they do not weigh. The practical lesson is that packing density still matters by air, through carton count and handling if not through the chargeable weight itself, and that a partial air shipment of the sizes you need first, with the balance by sea, often beats flying the whole order; the split is planned with production, not improvised at the airport.

Payment and freight terms interact here too: who books, who pays and at what point title moves are set out on our payment terms page, and the packing list (carton count, dimensions, gross and net weights, CBM) is the document both sides work from. Ask for the draft packing list at production end, not at vessel departure; the numbers on it are the numbers your freight quote should have been built on all along.

T-Shirt Packing Mistakes That Quietly Cost Freight

Four recur. First, approving the garment but never the packing specification, so the factory’s loosest default fold sets your CBM. Second, mixing sizes randomly in cartons (“assorted packing”), which wrecks counts at receiving and usually packs badly too. Third, oversizing cartons for a program and shipping the empty top third across an ocean; the right-size box is a specification, not a hope. Fourth, changing the fold or the bag at the last minute for retail presentation reasons without re-running the numbers, discovering the freight consequence on the invoice. Every one of these is a conversation available for free at order stage and expensive at shipment stage, which is the whole argument of this guide in miniature.

Weight per piece by fabric weight is the last piece of homework: a 160 GSM tee runs near 180 grams in a mid size, a 200 GSM tee near 240, and a 240 GSM heavyweight near 290, with sleeves, size and trims moving each figure. Multiply by your order, divide by your units per carton, and sanity-check the packing list you are sent; an order whose stated gross weight cannot be built from its own pieces is an order to question before it sails.

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