bag vs limit
1.0" to spareLightestOsprey Daylite Duffel 45
21 × 14 × 9 inA pound and a half for 45 litres inside a legal carry-on footprint, and it converts to a backpack. Nothing else here comes close on weight.
Allegiant Air allows a carry-on up to 22 × 16 × 10 inches including wheels and handles. No weight limit is published, but you have to lift it into the bin yourself. It costs extra — Costs extra on every fare.
Measure the outside, wheels and handles included — that’s what they measure at the gate.
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A pound and a half for 45 litres inside a legal carry-on footprint, and it converts to a backpack. Nothing else here comes close on weight.
Same footprint as the Road Runner but 1.8 lb lighter, an inch slimmer, and it holds more — no front pocket eating into the volume.
The reference point for one-bag travel. Suspended mesh backpanel, stowaway harness, a proper hipbelt, clamshell opening.
9.1" depth is a hair over the nine-inch box, but it’s soft and compresses. Legacy S/M and M/L versions still circulate with different specs.
The women’s-fit sibling to the Farpoint. Identical outer dimensions, different harness and torso geometry.
Only 7.75 inches deep. This is the bag to buy when depth is the thing that keeps catching you out rather than height.
Exactly 22 × 14 × 9 overall — genuinely legal with the wheels counted, which almost no other "20-inch" bag can claim. Lightest in this group, and it expands two inches.
The long-running budget Samsonite bestseller — micro-diamond polycarbonate shell, and it expands.
Retailers publish 20 × 14.5 × 9.5 for the case only. True overall height with wheels is 22 inches, and the width runs 15.
The cheapest credible hardside spinner and the default budget answer. Expands about 25 per cent, and the published dimensions explicitly include the wheels.
Routinely under $60, with eight multi-directional wheels and a five-year warranty. Nothing fancy, but it does the job.
Suitcase-style mesh organisation built in, so it replaces your packing cubes, wrapped in a TPU weatherproof shell. The design-forward one-bag pick.
10" depth exceeds the nine-inch sizer, though it compresses. Cotopaxi doesn’t publish exterior dimensions — these come from REI and Pack Hacker.
Built to maximum-legal geometry on purpose. The flat 22 × 14 × 8 box wastes almost no sizer volume, and it’s the only backpack here strictly inside 22 × 14 × 9 on all three axes.
A ripstop bomber duffel with lockable zips and stowable backpack straps that packs down into itself. The durability pick.
The Away and Monos alternative — front-opening laptop compartment and double TSA locks. Dimensions explicitly include the handles and wheels.
9.5 lb empty, the heaviest bag in this list by roughly two pounds. That matters on any 35 lb carrier.
Looking at the other size too? See Allegiant personal item sizes, the full Allegiant baggage guide, or our picks for the best Allegiant bags. Flying with a camera? 15 camera bags fit — see the camera bag guide.
| Cheapest fare | ✗ | Not included. Allegiant sells the carry-on as an add-on ($10–75 depending on route and when you buy), and it is cheapest at booking, dearer at check-in, dearest at the gate. |
|---|---|---|
| Bundled / higher fares | ✓ | Included once you buy a bundle or a higher fare — usually cheaper than adding the bag alone. |
| Elite status / co-brand card | ✓ | Included on the carrier’s own status tiers and qualifying cards. |
Allegiant Air publishes no aircraft-specific carry-on rule — the same limit is stated for its whole fleet. Only Delta, United and American publish rules that change with the aircraft, and we are not going to invent one for the others.
Wondering how big the bins actually are? Nobody publishes that — see what is actually known about overhead bin sizes.
22 × 16 × 10 inches including wheels and handles. No weight limit is published.
Yes. Costs extra on every fare. Pricing runs $10–75 depending on route and when you buy.
Yes. The outside of the bag is measured, so wheels, handles and external pockets all count. A suitcase sold as a "20-inch carry-on" is often 22 inches overall.
You pay at the gate, which is the most expensive point to buy.
Manufacturers publish dimensions inconsistently, and a “20-inch” spinner is almost never 20 inches once you count the wheels. Where a brand states dimensions including wheels and handles, that’s the number we use. Where it only publishes the case, we say so on the card. Airlines measure the outside of your bag — wheels, handles, straps and all. Anything marked borderline is down to the gate agent, and remember that a soft bag squashes into a sizer while a hard shell won’t.
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Limits verified August 2026 against each carrier’s published policy. Airlines change these without notice — always confirm before you fly. Spirit Airlines ceased operations on 2 May 2026 and is no longer listed.
Airline Bag Size Checker v1.0.15 · last updated 2026-08-12