Polycarbonate vs Aluminum Carry-On: The Weight Penalty, Priced

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The verdict

1. Buy polycarbonate unless you specifically want the metal. Inside every brand that sells both, the aluminum model is heavier, holds less and costs more at the same external size. LEVEL8 is the cheapest way to test the question because it publishes both materials in the same catalogue — see the current LEVEL8 carry-on range.
2. The weight penalty is 2 to 3 pounds, measured brand by brand. RIMOWA: 4.3 kg aluminum against 3.2 kg polycarbonate. Away: 10.5 lbs against 7.5 lbs. LEVEL8: 10 lbs against 7.7 lbs.
3. No brand publishes comparative impact data, and every warranty pays for function rather than appearance. That is the real answer to the dent-versus-crack question — whichever it does, if the bag still closes and rolls, you are paying for the repair.

The within-brand comparison, which is the only fair one

Comparing a $1,550.00 aluminum case against a $169.99 polycarbonate one tells you about brands, not materials. Three companies sell both materials in the same line, which lets you hold build quality roughly constant. All figures below were read on each brand's own pages on 22 September 2026.

RIMOWA. The aluminum Original Cabin is 55 x 40 x 23 cm, 4.3 kg, 35 L, $1,550.00. The polycarbonate Essential Cabin is 55 x 39 x 23 cm, 3.2 kg, 36 L, $990.00. Both pages state "Measurements include wheels and handles." Same height, same depth, one centimeter apart on width — and the metal one is heavier and holds a liter less.

Away. The Aluminum Carry-On is 21.5" x 13.5" x 9" exterior, 10.5 lbs, 32 L, $625, with the note "Measurements include handles, exterior components and wheels." The polycarbonate Carry-On is 22" x 14.4" x 9.1", 7.5 lbs, 41 L, $275. Here the aluminum bag is smaller on the outside, three pounds heavier and nine liters smaller inside, for $350 more.

LEVEL8. The Gibraltar Aluminum Carry-On is 22''L x 15''W x 8.4''H, 10 lbs, 36 L, $459.99; the Captain full-aluminum model is 14.7 x 8.5 x 21.3 inch, 10.8 lbs, 37 L, $1,099.99. The polycarbonate Luminous 20'' is 14.5'' x 9.2'' x 21.5'', 7.7lbs, 40L, $169.99, and the Road Runner is 14.5''L x 9.6''W x 21.7''H, 9.5lbs, 38L.

A note on what those numbers mean, because it is not uniform. RIMOWA and Away both state on the page that their measurements include wheels and handles. LEVEL8's Luminous figure comes from a size-guide column the brand headed "Over Dimension" and its Road Runner figure is labeled "Dimensions(including handle & wheels)" — both exterior. The Gibraltar and Captain pages carry no listed-versus-exterior label at all, so treating those two as exterior figures is an inference from the rest of the catalogue rather than something LEVEL8 printed.

Three brands, one direction. The aluminum bag in each line is heavier and holds less than the polycarbonate bag at a comparable external size. That is not a judgment, it is arithmetic on published specification.

Why aluminum loses volume at the same external size

The mechanism is visible in the spec sheets rather than in any lab test. An aluminum case is a rigid shell around a fixed frame with no expansion zip, so the external and internal boxes stay in a fixed relationship. Away publishes interior measurements for both of its models: 19" x 12.5" inside the aluminum bag against 20.1" x 13.9" x 7.5" inside the polycarbonate one. RIMOWA does not publish interior figures, and neither does LEVEL8.

That rigidity is also the selling point. LEVEL8 describes its aluminum frame as having "no zipper" with "Crash-proof Metal Corner Guards", and RIMOWA sells the Original as an anodized aluminum case "backed by a lifetime guarantee". If the way you break bags is by over-stuffing a zip, the zipperless construction is a genuine answer — see our listed versus overall dimensions explainer for why an expanded bag stops fitting in the first place.

Dent versus crack: what is actually published, and what is not

Here is the honest position. No brand in this comparison publishes comparative impact testing between its aluminum and polycarbonate shells. What exists is asymmetric marketing copy.

Away publishes numeric durability claims on its polycarbonate page — "Every Away handle design is tested through 1,500 pulls at up to 60 lbs" and luggage "loaded up to 60 lbs and repeatedly dropped every which way at 10° F" — and publishes no equivalent figures on its aluminum page. LEVEL8's Gibraltar page uses adjectives: "high-impact aerospace-grade aluminum" and "scratch-resistant material". LEVEL8's polycarbonate Luminous page claims an "Anti-scratch Surface" and a waterproof shell.

Take that scratch-resistance claim and hold it against the same brand's warranty page, which excludes damage from "abrasion ... normal wear and tear". Both statements are LEVEL8's. Only one of them is a commitment.

The warranty treatment is the part that decides it

This is where the materials question stops being aesthetic. Read the four guarantees in this category and a single rule emerges: they pay for function, and they do not pay for looks.

Travelpro excludes "Abrasions, scratches, dents or stains that do not impair the functional performance of the product" and "Normal wear and tear", and also excludes "damage caused by an airline, train service, cruise ship or other common carrier" unless you register for its Trusted Companion Promise.

LEVEL8 covers "any functional damage to the shell, wheels, handles, zippers" and excludes "abrasion ... normal wear and tear or transport damage (by airlines for example)".

RIMOWA covers "all functional damage" on suitcases bought from 25 July 2022 and says that "for any non-functional cosmetic wear and tear that occurs during your travels, our Care Experts will assess repair options and provide an estimate."

Away is the outlier and the most generous: its LifetimeCare coverage names "functional damage from manufacturing defects or unexpected rough travel", complimentary for the first five years with up to one replacement in that window.

Now apply that to the two materials. An aluminum shell's signature outcome is a dent — usually cosmetic, usually not covered. A polycarbonate shell's signature outcome is a crack or a split, which more often impairs closing or rolling and therefore more often falls inside "functional damage". We cannot tell you which happens more often, because nobody publishes that. We can tell you which one the paperwork is written to pay for.

If you want the strongest published terms in the category rather than the strongest marketing, our Briggs & Riley Baseline review is the benchmark.

The airline consequence

Aluminum cabin cases tend to be built to the European box rather than the American one. RIMOWA's Original Cabin is 55 x 40 x 23 cm, which is precisely the limit Lufthansa publishes, with a maximum of 8 kg. Against the American box — United at 9 in x 14 in x 22 in with the handle and wheels counted, Delta at 22" x 14" x 9" including handles or wheels, American at 22 x 14 x 9 inches, JetBlue at 22" L x 14" W x 9" H — that 40 cm width is over. LEVEL8's Gibraltar has the same problem at 15 inches wide.

Weight compounds it. An empty aluminum case at 4.3 kg or 4.5 kg consumes more than half of Lufthansa's 8 kg allowance before you pack. Southwest at 24" x 16" x 10" and Frontier at 24in by 16in by 10in up to 35lb are the forgiving exceptions. Run your own routes through the carry-on sizer tool, check the verified airline limits table, and if you fly long-haul read choosing a carry-on for 55 cm limits.

Who should buy aluminum anyway

Buy it if you want a zipperless case, you like the way the metal ages, and neither weight nor liters is your binding constraint. Read our LEVEL8 Gibraltar review for the cheapest credible entry and LEVEL8 against RIMOWA for the premium comparison. Buy polycarbonate if you want the capacity and the pounds back — our LEVEL8 Luminous review covers the value end.

Either way, current hard-side carry-on listings let you compare published weights across the field, and if the case is valuable enough that a gate-check would hurt, shipping it ahead is the only way to take the overhead bin out of the equation.

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FAQ

Is aluminum or polycarbonate luggage better?

On published specification, polycarbonate wins on weight, capacity and price inside every brand that sells both. Aluminum wins on rigidity and zipperless construction. Across RIMOWA, Away and LEVEL8 the aluminum model is 2 to 3 pounds heavier and, at Away, nine liters smaller inside at a smaller external size, as listed in September 2026.

Do aluminum suitcases dent easily?

No brand publishes comparative impact data, so any specific claim about denting rates is not sourced. What is published is that dents are usually treated as cosmetic: Travelpro's warranty excludes "Abrasions, scratches, dents or stains that do not impair the functional performance of the product", and RIMOWA quotes separately for non-functional cosmetic wear.

How much heavier is an aluminum carry-on?

RIMOWA lists its aluminum Original Cabin at 4.3 kg against 3.2 kg for the polycarbonate Essential Cabin. Away lists its Aluminum Carry-On at 10.5 lbs against 7.5 lbs for The Carry-On. LEVEL8 lists the Gibraltar at 10 lbs against 7.7 lbs for the Luminous 20-inch.

Does luggage warranty cover dents and scratches?

Generally not. Every guarantee in this comparison covers damage that impairs function and treats cosmetic damage as excluded or chargeable. Away is the broadest, covering functional damage from unexpected rough travel with complimentary repairs for five years; the others exclude abrasion, normal wear and tear, or carrier damage.