The Best Carry-On Luggage for Frontier Airlines

What Frontier actually publishes

Three figures, and they pull in different directions. The carry-on box is 24 × 16 × 10 in, which is two inches taller, two inches wider and an inch deeper than the 22 × 14 × 9 in standard that seven of the eleven US carriers we track publish. In volume terms that is 62.9 L of geometry against 45.4 L — a box you have to work at to overflow.

The second figure is a 35 lb weight cap, which most US carriers do not publish at all. The third is commercial rather than dimensional: on Frontier the overhead bag is a paid extra, and the 18 × 14 × 8 in personal item is the one that comes with the fare. Frontier’s published rules in full has the fare-by-fare detail.

So the buying question on Frontier is not “what fits”. Of the bags in our ledger with published dimensions, 23 clear the Frontier box. The question is what you are willing to carry and what you are willing to pay for.

Why we rank this page on weight

A weight cap counts the bag. Every pound of empty suitcase is a pound of clothes you cannot bring, and on a 35 lb allowance the spread between the bags in this ledger is dramatic.

The gap between the top and bottom rows is 7.9 lb of allowance — roughly a week of clothing. That is the entire argument for buying light on a carrier that publishes a cap, and it is why a $95 duffel beats a $189.99 hardside here on the axis that matters.

The fee changes the answer

Frontier is one of the carriers where the overhead bag is bought rather than included. That reframes the purchase: the cheapest carry-on on Frontier is frequently the one you do not use, because the personal item is free.

The free box is 18 × 14 × 8 in, or 33.0 L of geometry. That is more than it sounds — it is three quarters of the standard overhead box — and two bags in our ledger publish dimensions inside it. The personal-item bags we track covers that shelf properly, and which carriers charge for the bin puts Frontier next to the rest.

The picks, and who each is for

Every bag below clears the published Frontier box on all three dimensions. They are ordered by how much of the 35 lb allowance they leave you.

• Lightest, and the cheapest per covered year → Osprey Daylite Duffel 45. A published 1.4 lb and 45 L for $95, against a warranty with no stated end date. It converts to a backpack, and at $4.75 per covered year it is the cheapest figure in our ledger.
• Best wheeled bag for Frontier → Travelpro Maxlite 5. Its published 23 × 14.5 × 9 in is over the standard box at most carriers but comfortably inside Frontier’s, and at 5.4 lb it is the lightest wheeled case we track.
• Cheapest way into the bin → American Tourister Stratum 2.0 at a published $89.99, with a 10 year warranty term rather than an open-ended one.
• If you are walking anywhere → Osprey Farpoint 40. A published 3.27 lb for 40 L is the best weight-per-liter figure on this site at 0.08 lb per liter.

What actually fits the free box

If you are going to skip the paid bin, it is worth knowing what 33.0 L holds rather than guessing. Packed in cubes, the published 18 × 14 × 8 in box takes roughly:

• Four to five changes of clothes in a single 18 L cube — which is a published 0.32 lb of cube for the structure that keeps a soft bag in shape
• A laptop up to 16 in against the back panel
• A quart bag of liquids, which is a hard rule rather than a space question
• One pair of shoes, if you wear the bulkier pair

That is three or four nights for most people. Where it stops working is winter clothing and anything with a fixed shape — a coat and boots will fill the box on their own, which is the trip where Frontier’s paid bin is the honest answer rather than a fee to dodge.

One caution: Frontier prints the personal item as 14 in high by 18 in wide by 8 in deep, and a bag sold as an “18 inch backpack” is usually 18 inches tall. Check the published orientation, not just the numbers. What counts as a personal item covers how the rule is written.

How the box is measured

Frontier publishes its carry-on limit as a maximum including handles and wheels, which is the same convention American and Allegiant use and the reason a case marketed as “21 inch” is frequently 23 in as published. The figure printed on a retailer listing is often the body of the case only.

Every dimension on this site is the maker’s published overall figure for exactly that reason — how to measure a bag the way a sizer does is the two-minute version if you already own the bag and want to check it against Frontier’s box before you pay for the bin.

What to check before you buy

• The published weight, not the marketing weight. Every figure on this page comes from the maker’s own specification. Where a maker does not publish one, our table says “Not published” rather than guessing.
• Whether you will ever fly a stricter carrier. A bag bought to fill Frontier’s box is over the limit at the seven carriers publishing 22 × 14 × 9 in. The bags that clear the strict box is the list to buy from if you fly mixed carriers.
• Whether the fee is worth avoiding. Two or three paid carry-ons cost more than most of the bags on this page.