ABS vs PC vs Aluminium Frame: What Each Shell Really Costs Over Time

By Weiye Chen (Ben) · Hongbin Luggage Buying Guide · Published October 18, 2026

Why the unit price is a misleading number

Most buyers compare shells by one figure: the FOB unit price. ABS is the cheapest, polycarbonate (PC) sits a step above, and aluminium frame costs the most — so the "obvious" conclusion is that ABS wins on value and aluminium frame is for luxury brands only. That conclusion misses most of the bill. The real cost of a luggage shell is four parts: the unit price, the freight, the after-sales bill, and what the wrong positioning costs you. Each material changes all four parts, not just the first.

Cost one: weight eats your freight budget

Air and consolidated ocean freight charge whichever is greater — actual weight or volumetric weight. Every extra kilogram in the empty case is real money across a container or an air shipment. Published market data shows typical 20-inch carry-on weights of roughly 2.5–4 kg for polycarbonate, 3.5–5 kg for ABS, and 4.2–6.5 kg or more for aluminium frame (see Sources). A 28-inch aluminium-frame checked case can swallow a quarter of a 23 kg checked allowance before anything is packed. So the cheapest ABS on paper is not necessarily the cheapest landed: compare cost at landed level, not at FOB.

Cost two: impact behaviour decides your after-sales bill

The factory never sees the complaint — you do. ABS has the weakest impact resistance of the three; a hard knock in checked baggage can crack it. PC is tougher: it tends to dent or flex rather than split, so its claim rate is lower in checked use. An aluminium shell itself almost never breaks, but its surface collects dents and scratches — and "wear and tear" versus "quality defect" is the most common argument aluminium-frame buyers have with their own customers. Choose the wrong material and the expensive part is not the returned case; it is the brand damage and the hours of arguing.

Cost three: the aluminium frame's tooling and structure

An aluminium-frame case needs a frame mold, metal corner guards, latch locks and sealing gaskets — a longer process chain than a zipped case. Developing a new aluminium-frame shape takes noticeably longer to confirm, and spreading frame tooling across a small batch pushes the per-piece cost far above an equivalent PC case. Aluminium frame suits brands with a fixed shape that will run for years, not buyers testing the water with a small first order.

Cost four: positioning decides whether it is worth it

ABS lives in price-sensitive retail and promotional markets, where scale and turnover win. PC is the mainstream mid-range base that wholesalers and e-commerce brands buy most. Aluminium frame is a premium and corporate-gift positioning: the buyer is paying for the statement the case makes, not just the case. Match the material to the channel: taking aluminium frame into a price war is a losing cost structure, and taking ABS into a premium gift program invites returns that eat the margin.

The logic shifts with size

The 20-inch cabin case is the most weight-sensitive: with cabin limits at 7–10 kg depending on the airline, every 500 g of empty-case weight costs the traveller real packing capacity — and consumers notice. The 24-inch case has the highest turnover, and PC gives it the most balanced total cost. The 28-inch checked case takes the most punishment in baggage handling, which magnifies ABS's breakage risk; PC or reinforced ABS is the safer pick there. Aluminium-frame 20-inch carry-ons work as brand-image pieces; the volume drivers are PC checked cases.

Material	Weight feel (20" cabin, approx.)	Durability profile	Natural market
ABS	3.5–5 kg	Affordable, but cracks under hard impact	Price-sensitive retail, promotions
PC	2.5–4 kg	Bends instead of breaking; balanced claims	Mainstream wholesale, e-commerce brands
Aluminium frame	4.2–6.5+ kg	Shell nearly indestructible; surface dents show	Premium brands, corporate gifts

5 things to confirm with the factory before ordering

1. Get the empty-case weight on a scale, not from a spec table. Freight math and cabin limits both use real weight.
2. Ask for the shell thickness. Two cases both labelled "PC" can have very different impact resistance — and very different claim rates — depending on shell thickness.
3. For aluminium frame, settle mold ownership and confirmation time. Who pays for the frame mold, who owns it, and how long a change takes should be in writing.
4. Ask for drop and load test reports. Handles, wheels and shells should have written test reports — not a verbal "no problem".
5. Confirm lead time per project. More complex structures mean tighter production scheduling; only a written per-project confirmation counts.

Three traps to avoid

Trap one: buying ABS on price and ignoring breakage risk in checked sizes. The 28-inch size punishes weak shells — total cost flips once returns start.

Trap two: assuming "all PC is equal". Shell thickness and wheel/handle quality vary more than the material label suggests. Always weigh and test the actual sample.

Trap three: launching with aluminium frame before the positioning is proven. If the premium channel is not ready, you pay luxury cost structure for mainstream sales.