One Number Settles the Whole Debate
A 20-inch aluminum carry-on weighs between 4.2kg and 4.8kg. A comparable high-end PC carry-on weighs between 2.8kg and 3.2kg. That's a 1.5kg gap — roughly 20% of a standard 7kg airline cabin allowance.
I've managed production lines at Jiangxi Chengleke (CLK) for nearly two decades, and I've watched brands succeed or stumble based on this one decision: aluminum-magnesium alloy or high-grade polycarbonate. It defines your manufacturing cost, your retail price point, and your brand's technical identity. Here's the honest analysis, with the data.
This article keeps the physics and the money separate from brand strategy: if your real question is how full-aluminum, PC and aluminum-frame PC should sit in one product range, see our aluminum vs polycarbonate brand-positioning guide; to position this pair among every shell material, start with the the material comparison behind these numbers.
Dents Tell Stories. Flex Sells Fewer Returns.
Aluminum and PC handle stress in fundamentally different ways, and neither is "wrong." Every route that follows — zipper shell, aluminum frame or hard-shell construction — carries its own structural logic.
Aluminum is a rigid, non-elastic material. When a baggage handler drops a heavy blow on it, the energy is absorbed through deformation — it dents. Many luxury travelers wear those dents like a patina of travel, each one a story. But technically, a major dent can misalign the aluminum frame, and a misaligned frame makes the suitcase hard to close.
Polycarbonate is the opposite: an elastic polymer. Struck, it flexes, and thanks to the molecular memory of virgin Covestro Makrolon ET3113 PC (formerly Bayer PC), it returns to its original shape. For a brand owner, that translates to a significantly lower functional failure rate.
If your customer is the high-frequency road warrior who prioritizes technical performance, PC wins. If your brand is an aspirational luxury statement, the permanence of aluminum is unmatched. Match the physics to the lifestyle — that's the whole trick.
The Weight Penalty and the Airline Math
| Item | Full aluminium (20-inch) | High-end PC (comparable 20-inch) | Difference and what it means |
|---|---|---|---|
| Empty-case weight | 4.2–4.8 kg | 2.8–3.2 kg | About 1.5 kg, roughly 20% of a 7 kg cabin allowance |
| Behaviour after impact | Rigid structure; a point impact leaves a permanent dent | Flexes and springs back; no permanent dent | Two different failure modes, not a ranking of durability |
| Failure the customer accepts | Visible dents and surface scratches, with the structure intact | Surface scuffing, and cracking possible after extreme stress | The brand has to decide which failure it can live with |
| Cost structure | More operations: metal forming, surface finishing, riveting, frame alignment, hand assembly | Fewer operations and more room to take out weight | A lower quote can come from a different blend, more regrind or cheaper hardware |
| Weight verifiability | Check it on a luggage scale at arrival | The same | Weight is the easiest specification to state and to audit |
| Room to cut cost | Little room on the aluminium parts | Weight can come out by removing features such as front opening, aluminium frame, electronic handle, large wheels and laptop sleeve | Features eat the weight advantage of PC |
| Brand story | Flagship and statement pieces, where the customer accepts the weight, the price and visible age | Volume and high-quality everyday cases | The strongest play is often PC as the base and aluminium as the price anchor |
Short answer: insist the empty weight is a measured production figure with a stated tolerance, because a design-target number is not a specification. Weight is unusual among specifications in that a buyer can verify it on arrival with a luggage scale, which makes it simultaneously the easiest claim to make loosely and the easiest one to audit. Ask for the number, the sample size it came from, and the spread between the lightest and heaviest unit in that sample. On a moulded shell the spread comes mainly from sheet thickness and hardware batches, and a few hundred grams of variation is normal; what matters is that the figure quoted to your customer sits inside the range you can actually ship. Put the nominal weight and the tolerance side by side on the spec sheet, and the weight conversation stops being a claim.
Every gram matters when carry-on limits are strict. A standard 20-inch full-aluminum carry-on typically weighs 4.2kg–4.8kg; a comparable high-end PC carry-on weighs 2.8kg–3.2kg. The 1.5kg difference is about 20% of a 7kg cabin limit.
Wholesalers have to think about the consumer's landing cost, not just the factory price. Travelers are increasingly choosing lightweight PC cases for international routes to dodge excess baggage fees. If you're selling into that market, the weight table on your spec sheet matters as much as the shell texture.
Where the Money Actually Goes
| What to check | Why it must be written down | How to verify |
|---|---|---|
| Nominal empty weight | A design-target number is not a specification | Ask for the measured production value, not a figure calculated from the drawing |
| Tolerance | A weight without a tolerance cannot pass or fail | Write it on the specification next to the nominal value |
| Sample size and spread | How many samples the number came from, and the gap between heaviest and lightest, decide whether the batch is stable | Ask for the sample size and the spread inside it |
| Method and unit | So the figure can be checked at arrival | Finished weight including wheels and handle, in kg, with the instrument named |
| Load capacity | A load rating without a standard is marketing language | Write it as "25 kg dynamic load per ISTA 1A", with the test attached |
| Drop test conditions and result | "Tested" on its own means nothing | Ask for the drop height, which faces, corners and edges, and the result |
| Wheel, handle and grip fatigue | Decides whether the case still works in year three | Ask for distance and cycle counts, not the word "passed" |
| Golden sample | The reference that production is compared against | Seal a sample and record its status |
The upfront investment for aluminum is higher. Molds for metal shell pressing are specialized and expensive, and high-precision riveted frames demand manual assembly — that labor doesn't come free. But aluminum luggage carries a longer retail shelf life and a higher perceived value, which supports premium markups.
PC manufacturing is faster and more scalable, riding on automated vacuum forming and injection molding. For a 2026 expansion, the question becomes capital allocation: can your budget absorb the higher upfront cost of an aluminum line, or is the high-volume potential of a PC line the safer bet?
We build a detailed cost-to-value matrix for both materials and walk partners through it line by line. A material choice made on data, not on vibes, is the difference between a collection that sells and one that gathers dust.
My Honest Take
After nearly two decades of this, I'll say it plainly: there is no objectively better material, only a better match. The brands that win are the ones that align the material with the consumer's actual life — the road warrior's back, the luxury buyer's shelf. Bring us your positioning and we'll run the numbers with you. Start at www.clkluggage.com and ask for the technical ROI analysis; it's the conversation we enjoy most.
About the Author
Written by the CLK Manufacturing Team — custom luggage OEM/ODM experience since 2009 from our factory in Ji'an, Jiangxi, China. Updated: 2026-08-15.
Related Products & Sourcing
CLK Luggage (Jiangxi Chengleke Leather Co., Ltd.) manufactures custom hard-shell luggage, aluminum-magnesium cases and luggage sets for brands, retailers and corporate clients. Relevant resources:
- Browse our luggage sets and custom OEM/ODM luggage manufacturing
- Why choose CLK — factory profile, quality control and certifications
- Get a quote: contact our team or email clkbusiness@clkluggage.com
Aluminum vs polycarbonate head to head
| Dimension | Aluminum (aluminum-magnesium alloy) | Polycarbonate (high-grade virgin Covestro Makrolon ET3113 PC) |
|---|---|---|
| 20-inch carry-on weight | 4.2kg–4.8kg | 2.8kg–3.2kg |
| Response to impact | Rigid and non-elastic: the energy is absorbed through deformation, so it dents | An elastic polymer: struck, it flexes and returns to its original shape thanks to molecular memory |
| Failure mode to watch | A major dent can misalign the aluminum frame, and a misaligned frame makes the suitcase hard to close | A significantly lower functional failure rate |
| Upfront investment | Higher: molds for metal shell pressing are specialised and expensive, and high-precision riveted frames demand manual assembly | Lower: automated vacuum forming and injection moulding |
| Scaling | — | Faster and more scalable |
| Retail characteristics | Longer retail shelf life and higher perceived value, which supports premium markups | — |
| Best brand fit | An aspirational luxury statement | The high-frequency road warrior who prioritises technical performance |
The weight math on a 20-inch carry-on
| Item | Figure |
|---|---|
| Standard full-aluminum carry-on | 4.2kg–4.8kg |
| Comparable high-end PC carry-on | 2.8kg–3.2kg |
| Difference | 1.5kg |
| As a share of a standard 7kg cabin allowance | Roughly 20% |
Frequently asked questions
Which is lighter, aluminum or polycarbonate?
Polycarbonate. A standard 20-inch full-aluminum carry-on weighs 4.2kg–4.8kg, while a comparable high-end PC carry-on weighs 2.8kg–3.2kg. The 1.5kg difference is roughly 20% of a standard 7kg cabin allowance, which is why travellers increasingly choose lightweight PC cases on international routes to avoid excess baggage fees.
Will aluminum luggage dent?
Yes, and that is inherent to the material rather than a defect. Aluminum is rigid and non-elastic, so a heavy blow is absorbed through deformation. Many luxury travellers regard the dents as a patina of travel, but technically a major dent can misalign the frame and make the case hard to close.
Which shell has the lower failure rate?
Polycarbonate, on functional failure. Struck, it flexes and returns to its original shape through the molecular memory of virgin Covestro Makrolon ET3113 PC, which translates into a significantly lower functional failure rate for a brand owner. Aluminum's advantages are different: a longer retail shelf life and a higher perceived value.
Which material needs more upfront capital?
Aluminum. Molds for metal shell pressing are specialised and expensive, and high-precision riveted frames require manual assembly. PC manufacturing is faster and more scalable because it rides on automated vacuum forming and injection moulding — so the real 2026 question is capital allocation.
Which should I choose for my brand?
There is no objectively better material, only a better match. If your customer is the high-frequency road warrior who prioritises technical performance, PC wins. If your brand is an aspirational luxury statement, the permanence of aluminum is unmatched. Match the physics to the lifestyle.