Last updated: April 2026
Polycarbonate carry-ons are the better choice for most travelers. They're 2 to 3 pounds lighter, 30 to 50% cheaper, and hold up fine for cabin use. Aluminum is still worth it if you prize clamshell security, the look of a premium metal shell, and you don't fly weight-restricted airlines.
I've been writing about carry-on luggage for years, and the aluminum-vs-polycarbonate question is the one readers get most worked up about. Brand blogs gloss over it. Forum threads argue past each other. What people actually want is a straight answer, grounded in real numbers, that takes their travel style seriously.
So here's my answer, with the specs to back it up.
Quick picks
- Best polycarbonate carry-on: Away The Carry-On. $275, 7.5 lbs, 21.7 × 14.4 × 9 inches.
- Best aluminum carry-on (mainstream): Away The Carry-On: Aluminum. $625, 10.1 lbs, 21.5 × 13.5 × 9 inches.
- Best premium polycarbonate with lifetime warranty: Briggs & Riley Torq International 21". $579, 6.9 lbs, 21 × 14 × 9 inches.
What follows is the reasoning: what the two materials actually do differently, where the weight penalty bites, when the aluminum premium is worth it, and which bag I'd buy for your specific travel pattern.
What's Actually Different Between Aluminum and Polycarbonate?
An aluminum carry-on is a two-piece metal clamshell. The front and back halves are machined or pressed from anodized aluminum sheets, joined by a hinged spine, and held shut by two or three latches, often combined with TSA-approved combination locks. There's no zipper. When you open the bag, it splits in half and lies flat, with compression straps or dividers on each side. The frame adds weight, but the closure feels unambiguously solid: metal meeting metal.
A polycarbonate carry-on is a thermoformed plastic shell with a zippered gusset running around three sides. The shell is made from a single sheet of polycarbonate heated and pressed into shape, with an internal fabric lining and usually a dividing panel. The zipper can flex when you overpack, which is part of the appeal. You get a lighter bag, a bit more internal capacity for the same exterior footprint, and a more conventional open-and-load experience. The zipper is the weakest point in the design.
Those two construction choices drive every other trade-off in this guide: weight, price, durability pattern, security, and how forgiving the bag is when you try to jam one more pair of shoes in. (If you're also weighing softside options, our hard shell vs soft shell guide covers that layer of the decision.)
The Durability Question: Cosmetic vs Structural
Brand blogs love to flatten durability into a single winner. The reality is that these two materials fail in completely different ways, and once you understand that, the choice gets a lot simpler.
Aluminum dents. Polycarbonate flexes.
A well-known summary from owners in travel forums puts it cleanly: "Aluminum and polycarbonate both provide sufficient protection in 99% of situations. One big difference is that aluminum will bend and dent, while polycarbonate tends to shatter or snap."
The physics are straightforward. A sharp, concentrated impact (a forklift corner, a dropped suitcase stacked on top of yours) is what aluminum handles best. The metal resists puncture and holds its shape against a point load. A broad, distributed impact (a drop from the overhead bin, a hard landing against a carousel wall) is what polycarbonate handles best. The shell flexes, absorbs the hit, and usually returns to shape.
One Rimowa owner in a luggage forum explained it well: with force spread over a larger area, polycarbonate "will withstand it better because it's more flexible and will bounce back, while the aluminum will flatten and be unusable." With a spike-type force, the aluminum wins.
For carry-on use specifically (a bag that lives in the overhead bin, rides the odd gate check, and rarely gets stacked under another suitcase) both materials are more than strong enough. The question isn't really "will it survive." It's "what will it look like in two years."
How fast does aluminum actually scuff?
Weeks. Not years.
Owners who fly more than 20 times a year consistently report that aluminum carry-ons pick up visible scratches within the first few trips and start showing small dents by the six-month mark. One traveler summed up the aluminum look this way: "It looks amazing out of the box, but it starts showing its age much quicker."
Some owners love this. They call it patina, and there's a legitimate aesthetic argument that a well-worn aluminum case looks more lived-in and interesting than a pristine one. Others find it genuinely ugly. A $1,000 bag that looks dinged-up after a long weekend is hard to enjoy.
Before you commit to aluminum, decide honestly which camp you're in. If you'd be bothered every time you rolled a dented shell through an airport, polycarbonate is the safer choice. If you'd find the wear charming, aluminum starts making more sense. Our roundup of the most durable carry-ons tested against wear and tear goes deeper on how specific models hold up.
Can polycarbonate really crack?
Yes, but rarely, and almost never in cabin-only use.
Crack reports tend to come from checked-luggage scenarios: polycarbonate left on a cold tarmac in the Midwest in January, then slammed into something hard by a baggage handler. Low-quality polycarbonate (the $60 hardside bags you see at discount retailers) is also more prone to cracking at the corners, where the shell is thinnest.
Quality polycarbonate from brands like Away, Briggs & Riley, or Monos (the bags you'd actually be weighing against an aluminum purchase) very rarely cracks under normal carry-on wear. If your bag lives in the overhead bin and sees gate-check duty once or twice a year, cracking is a theoretical concern, not a practical one.
The Weight Delta, Quantified
Here's the comparison no brand blog will show you, because it doesn't flatter aluminum.
When you isolate the material variable (same brand, same model line, same exterior dimensions) the weight penalty for choosing aluminum is stark:
| Brand / Model | Polycarbonate | Aluminum | Delta |
|---|---|---|---|
| Away The Carry-On / Aluminum | 7.5 lbs | 10.1 lbs | +2.6 lbs |
| Arlo Skye Zipper Max / Frame Max Aluminum | 7.0 lbs | 10.5 lbs | +3.5 lbs |
That's a 35 to 50% weight increase for the same bag footprint. It's not a rounding error. It's a structural consequence of what aluminum costs to make rigid enough for luggage use.
What 2.5 to 3.5 lbs actually means for packing
Roughly one pair of jeans, a sweater, and a pair of shoes. That's your aluminum tax, paid in clothes left at home.
For domestic US flights on major carriers like Delta, United, and American, it doesn't matter. None of those airlines weigh your carry-on at the gate under normal circumstances. You can fly Away Aluminum for a decade and never have the bag weighed.
For weight-restricted carriers, the math is brutal. Ryanair allows 10 kg, roughly 22 pounds, as the total for your cabin bag plus everything in it. An aluminum carry-on weighing 10.1 lbs empty leaves you 11.9 lbs for clothes, electronics, toiletries, and a book. A polycarbonate equivalent at 7.5 lbs leaves you 14.5 lbs. That's a 22% increase in usable packing capacity before you've even started.
EasyJet's 15 kg cabin limit is more forgiving, but the principle stands. Many Asian carriers (Cathay Pacific, Singapore Airlines, ANA) enforce 7 kg (15.4 lb) carry-on limits strictly. An aluminum bag plus anything heavier than a t-shirt puts you over.
If you fly these carriers even occasionally, aluminum is not a reasonable carry-on choice. The weight budget just doesn't work. We keep a running list of carry-ons under 7 lbs built for weight-restricted airlines if you want to see the sub-7-lb field.
Price: Is the Aluminum Premium Justified?
The short answer: no, not for durability reasons. Yes, for aesthetic and build-feel reasons, if those matter to you.
Here's how the price tiers actually shake out in 2026:
- Entry polycarbonate: $80 to $200 (Amazon Basics, American Tourister, Samsonite)
- Quality polycarbonate: $275 to $600 (Away, Monos, Briggs & Riley, Arlo Skye)
- Mid-tier aluminum: $625 to $900 (Away Aluminum, Arlo Skye Frame)
- Premium aluminum: $1,400+ (Rimowa, MVST)
The cheapest credible aluminum carry-on in our catalog is the Away Carry-On: Aluminum at $625. The polycarbonate version of the same bag is $275. That's a $350 premium, more than the entire cost of the polycarbonate version, for the identical shape and dimensions in a different material.
Where does that $350 go? Machining and anodizing an aluminum shell is genuinely expensive compared to thermoforming a plastic one. The hardware (latches, reinforced corners, the metal frame) adds cost. And there's real brand positioning at play: aluminum cases have become status symbols in the premium luggage world, and the pricing reflects what the market will pay.
Are aluminum suitcases worth the extra money? Only if you specifically want the look, the feel of a clamshell latch, and the ownership pride that comes with a metal case. For pure function (getting you and your stuff from home to a hotel) a $275 polycarbonate bag does the job just as well, sometimes better.
Security and Closure: Latches vs Zippers
This is where aluminum has a real functional advantage, and it's one the polycarbonate camp tends to sidestep.
Aluminum carry-ons close with latches, usually two metal clasps, often combined with TSA-approved combination locks. There's no zipper to snip with a pen or ballpoint, which is a documented vulnerability on zippered bags. The bag shuts with a satisfying metal clunk, and once it's latched, it stays latched. For anyone who travels through airports or cities with real theft concerns, the clamshell latch is meaningfully more secure.
The trade-off: latch alignment can get finicky if the shell warps, which aluminum does when it takes a solid hit. I've seen owners report needing to press both sides of a dented bag together hard to get the latches to seat. Not a dealbreaker, but a real-world annoyance.
Polycarbonate carry-ons use zippers, usually running around three sides of the shell with a gusset that lets the bag expand slightly. Modern quality zippers are durable (I've seen 500-trip reports on Away bags where the zipper outlasted the wheels) but they remain the design's weakest point. They're also easier to cut through with a pen, though any serious thief would just take the whole bag.
TSA-approved locks work on both. But if closure security matters to you for reasons beyond TSA inspections (anti-theft while you're on a train platform, keeping the bag shut during rough handling) aluminum is the more reassuring choice.
Capacity and Packing: The Hidden Polycarbonate Advantage
One of the most underrated reasons to choose polycarbonate: for the same outer dimensions, you get more usable packing space.
A polycarbonate zipper gusset adds 5 to 10% of internal volume because the shell can flex outward slightly when you close it. If you pack to the brim and compress, a polycarbonate bag forgives you. An aluminum clamshell doesn't. The frame is rigid, and if your contents don't fit, the latches won't close.
One owner in a premium luggage forum put the pragmatic case this way: polycarbonate "is lighter, easier to close, and offers better capacity because the material can flex and twist." For one-bag travelers and anyone who packs to the limit, that flex is genuinely valuable.
Aluminum's rigidity has one corresponding virtue: it's easier to organize. Compression straps on each side of a clamshell hold your packing cubes exactly where you put them, and the flat geometry makes packing a predictable exercise. If you're a structured packer who likes everything in its place, you'll probably prefer the aluminum layout.
Warranty: Where the Real Differences Live
Here's the finding that surprises most readers: polycarbonate carry-ons often have better warranty terms than aluminum ones.
Polycarbonate warranty leaders
Briggs & Riley Torq International 21". $579, 6.9 lbs. Briggs & Riley's lifetime guarantee explicitly covers airline damage, which is almost unheard of in the category. If a baggage handler breaks the handle, the wheel, or the shell itself, they repair or replace it. No receipt required. No year limit. It's the strongest warranty in mainstream carry-on luggage, and it only applies to their polycarbonate and softside lines. They don't make aluminum.
Away The Carry-On. $275, 7.5 lbs. Limited lifetime warranty on all Away products. Reports from long-term owners in travel forums consistently describe fast, no-argument replacements. One owner who traveled 500 trips over seven years had a compression clip break, emailed Away, and had a replacement bag within five days.
Monos Carry-On. 100-day trial period, followed by a lifetime warranty on manufacturing defects. Slightly narrower coverage than Briggs & Riley but better than most brands.
Aluminum warranty reality
Rimowa Classic (aluminum). 5-year warranty. Cosmetic dents, scratches, and surface wear are explicitly excluded. Given that aluminum's main failure mode is cosmetic, this is a significant limitation.
Away Aluminum Edition. Limited lifetime warranty. Cosmetic wear excluded. Structural defects covered.
Arlo Skye Frame. Limited lifetime on manufacturing defects. Cosmetic wear excluded.
None of the major aluminum warranties cover the thing that actually goes wrong with aluminum bags. If you buy aluminum expecting warranty protection against the inevitable dents and scratches, you'll be disappointed. If you buy polycarbonate expecting warranty protection against handling damage, Briggs & Riley will actually back that up.
Choose Your Scenario: Which Material for Which Traveler?
There is no single winner in this debate, and any article that claims otherwise is either selling you something or hasn't looked at the data. Here's how I'd think about the decision by travel pattern.
Domestic US frequent flier (Delta, United, American)
Either material works. US major carriers don't weigh carry-ons at the gate in any meaningful way, and overhead bin sizes accommodate standard carry-on dimensions in both materials. This is the one scenario where aluminum is fully viable: the weight penalty costs you packing capacity but no actual gate-check risk.
If aesthetic matters to you and budget allows, Away Aluminum is a reasonable choice. If you're optimizing for value, Away polycarbonate does the same job for $350 less.
Weight-strict budget carrier (Ryanair, easyJet, Spirit)
Polycarbonate, full stop. The weight budget on Ryanair and Spirit is tight enough that an aluminum carry-on eats most of your packing allowance before you've packed a single item. Don't fight the math.
The Briggs & Riley Torq International 21" at 6.9 lbs is the premium pick here. The Away Carry-On at 7.5 lbs is the mainstream pick.
International long-haul, business traveler
Aluminum is viable if the aesthetic matters to you and you're not one-bagging. Polycarbonate is the sensible pick if you pack close to the weight limits on long trips or fly business class on weight-conscious international carriers.
If you want the look of aluminum at a price point below Rimowa, the Arlo Skye Frame Carry-On Max at $895 is the quiet-luxury alternative.
One-bag traveler, digital nomad
Polycarbonate. Weight matters every time you board a plane, take a long walk with the bag, or lift it overhead, and you'll be doing all three more than most travelers. The capacity flex from a zipper gusset also rewards careful packers who squeeze in one more layer.
Occasional traveler who wants a "nice bag"
This is the only case where the aesthetic argument for aluminum is strongest, because you'll see the bag more than you use it. But be honest: a $625 aluminum bag used four times a year for a decade costs $15 per use. A $275 polycarbonate bag does the same job for $7 per use and looks better at the end of the run because it hasn't been beaten into visible patina.
I'd still lean polycarbonate for occasional use, but if aluminum is the bag that will actually make you excited to travel, that's a legitimate reason to buy it.
Our Picks, by Tier and Use Case
Best overall polycarbonate carry-on: Away The Carry-On
$275, 7.5 lbs, 21.7 × 14.4 × 9 inches. The mid-range default for a reason. Away's polycarbonate shell is durable enough for weekly travel, the 360-degree wheels are among the smoothest in this price range, and the warranty support from the company is consistently described as fast and generous. The interior compression system works well for short trips; the color selection is broader than any competitor's.
The limitation: at 7.5 lbs, it's not the lightest polycarbonate in the category. A Briggs & Riley Torq International 21" will save you 0.6 lbs. But Away's everyday value is hard to beat, and for most travelers, this is the bag I'd recommend first.
Best premium polycarbonate: Briggs & Riley Torq International 21"
$579, 6.9 lbs, 21 × 14 × 9 inches. The lifetime guarantee including airline damage is the draw, and it's genuine. Briggs & Riley has been honoring this policy for decades. The Torq line is lighter than almost every aluminum competitor and still feels premium thanks to the thicker shell and the engineered self-repairing tracks on the telescoping handle.
The limitation: it's expensive for a polycarbonate bag, and you're paying a premium for warranty coverage you may never need to use. The styling is also more corporate than the Arlo Skye or Away options. It looks like business luggage, because it is.
Best aluminum carry-on (mainstream): Away The Carry-On: Aluminum
$625, 10.1 lbs, 21.5 × 13.5 × 9 inches. The entry point for aluminum without committing to Rimowa pricing. You get the clamshell construction, the metal latches, the TSA-approved combination locks, and Away's strong warranty support. The dimensions are slightly smaller than the polycarbonate version, which helps with overhead bin fit in smaller commuter aircraft.
The limitation: at 10.1 lbs, it's 2.6 lbs heavier than the polycarbonate version for the same brand and roughly the same external footprint. The anodized shell will pick up scratches within the first few trips. You're buying into the patina aesthetic whether you like it or not.
Best premium aluminum (non-Rimowa): Arlo Skye Frame Carry-On Max: Aluminum
$895, 10.5 lbs, 23 × 15 × 9.6 inches. Rimowa-adjacent quality without the Rimowa price tag. The monochrome silver finish, the oversized combination latches, and the self-aligning clamshell hinge give the bag a premium feel that reads as quiet luxury rather than status flex. The 23-inch exterior height puts it on the upper edge of carry-on sizers, so verify with your specific airline before buying.
The limitation: at 10.5 lbs, it's the heaviest bag in our selection. And at 23 × 15 × 9.6 inches, it's large enough that some international carriers, particularly Asian airlines with 55 × 35 × 25 cm limits, will flag it at the sizer. Check your airline's specific dimensions before committing.
Frequently Asked Questions
Is aluminum or polycarbonate better for carry-on luggage?
Polycarbonate is the better choice for most carry-on travelers because it's 2 to 3 pounds lighter, 30 to 50% cheaper, and holds up fine for cabin use. Aluminum is the better choice if you prioritize clamshell security and the look of a metal shell, and you don't fly weight-restricted airlines.
Are aluminum suitcases worth the extra money?
Aluminum suitcases are worth the premium only if you specifically value the aesthetic, the feel of metal latches, and the ownership pride that comes with a clamshell case. For pure function (getting your things from home to hotel) a polycarbonate bag at half the price performs equally well and often has better warranty terms.
Does polycarbonate crack easily?
Quality polycarbonate from brands like Away, Briggs & Riley, and Monos rarely cracks in normal carry-on use. Cracking is more common with low-quality polycarbonate, checked-bag abuse, or extreme cold combined with hard impact. For a bag that lives in the overhead bin, cracking is a theoretical concern rather than a practical one.
Is aluminum luggage too heavy for carry-on?
Aluminum luggage is viable for carry-on on US major carriers that don't weigh bags at the gate. It's problematic for weight-restricted airlines like Ryanair (10 kg limit), easyJet (15 kg), and many Asian carriers (7 kg), where the 10-plus-pound empty weight eats half your packing allowance.
Do aluminum suitcases dent easily?
Yes. Aluminum carry-ons typically show visible scratches within the first few trips and small dents by the six-month mark of frequent use. The dents don't affect function, and many owners embrace the patina look. If you'd be bothered by visible wear, polycarbonate is the more forgiving choice.
Which lasts longer, aluminum or polycarbonate?
Structurally, both last indefinitely in cabin-only use. Cosmetically, polycarbonate stays looking newer far longer. Aluminum accumulates scratches and dents quickly but retains structural integrity even when visibly worn. "Lasts longer" depends on whether you mean "keeps working" or "keeps looking good."
Is Rimowa aluminum worth it over polycarbonate?
Rimowa aluminum is worth the roughly 2x price premium only if you value the brand, the aesthetic, and the feel of the clamshell. Functionally, the Rimowa Essential polycarbonate line performs similarly for about half the price, with a lighter weight and broader color selection. The aluminum is the status buy. For a Rimowa-vs-Away matchup at similar price points, see our Rimowa vs Away comparison.
Can a dented aluminum suitcase be repaired?
Minor dents can sometimes be pushed out from the inside, but significant dents are effectively permanent. Aluminum shells aren't designed to be reshaped. Rimowa and a few specialty repair shops offer panel replacement on premium models, but the cost often approaches a new bag. Plan to live with the dents or buy a replacement.
The Bottom Line
For most travelers, most of the time, polycarbonate wins on practicality. It's lighter, cheaper, more forgiving, and, thanks to Briggs & Riley and Away, often better backed by warranty. If you're optimizing for a bag that performs well across every travel scenario without fuss, buy the Away Carry-On in polycarbonate and get on with your trip.
Aluminum still has a place. If you love the look, value the clamshell security, fly mostly US domestic, and have the budget for a $625-plus bag, the Away Aluminum or the Arlo Skye Frame Max will give you that without stepping into Rimowa's price range. Just go in knowing what you're buying: an aesthetic and a build feel, not a durability upgrade.
For a deeper side-by-side on specs, try our comparison tool, or check out our lightest carry-on collection if weight is the deciding factor for your next trip.