Does the Travelpro Maxlite 5 21" Expandable Spinner fit Frontier Airlines' carry-on?

Yes. Fits with at least 2.5 cm to spare on every side. It's too big for Frontier Airlines' personal item (12.7 cm too long). On Frontier Airlines' cheapest fare the carry-on costs extra.

Fits

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Side the bag fails onPart that sticks outSizer frame

Fits

Fits with at least 2.5 cm to spare on every side.

BagTravelpro Maxlite 5 21" Expandable Spinner

Cabin bagFrontier Airlines

Length: 58.4of 61 cm2.6 cm spare
Width: 36.8of 40.6 cm3.8 cm spare
Depth: 22.9of 25.4 cm2.5 cm spare

Weight15.9 kg limit

Packed weightkg

Empty it weighs 2.45 kg, leaving 13.5 kg for your things.

What you can do

Frontier Airlines charges for this bag on the cheapest fare, so add it when you book.

See bags that fit Frontier Airlines

Frontier Airlines rules checked 2 Nov 2026. Source. Sizes include wheels and handles. Some details are still being confirmed.

Side by side

Travelpro Maxlite 5 21" Expandable Spinner against Frontier Airlines' limits. Bags can be turned, so the longest side is compared with the longest limit.

Carry-on: 61 × 40.6 × 25.4 cm, 15.9 kg
Side	Bag	Limit	Result
Length	58.4 cm	61 cm	2.6 cm spare
Width	36.8 cm	40.6 cm	3.8 cm spare
Depth	22.9 cm	25.4 cm	2.5 cm spare

Personal item: 45.7 × 35.6 × 20.3 cm
Side	Bag	Limit	Result
Length	58.4 cm	45.7 cm	12.7 cm over
Width	36.8 cm	35.6 cm	1.2 cm over
Depth	22.9 cm	20.3 cm	2.6 cm over

Empty it weighs 2.45 kg of the 15.9 kg limit.

Frontier Airlines rules worth knowing

Carry-on: 24 × 16 × 10 in, 35 lb. Always a paid add-on.
Personal item: 14 × 18 × 8 in including straps, wheels and handles. Strictly enforced with a sizer.
Spirit Airlines used the same 18 × 14 × 8 in personal item before it stopped flying in 2026.

Airlines where the Travelpro Maxlite 5 21" Expandable Spinner fits

Southwest Airlines All airlines

Bags that fit Frontier Airlines' carry-on

Biggest first.

Samsonite Freeform Carry-On Spinner58.4 × 38.1 × 24.8 cmTight0.6 cm to spareBag page
Away Bigger Carry-On57.7 × 39.1 × 24.4 cmTight1 cm to spareBag page
Rimowa Essential Cabin55 × 39 × 23 cmFits1.6 cm to spareBag page
Away Carry-On55.1 × 36.6 × 22.9 cmFits2.5 cm to spareBag page

Good to know

Will the Travelpro Maxlite 5 21" Expandable Spinner still fit Frontier Airlines when it's packed?

It should. It has 2.5 cm to spare on its tightest side, and a stuffed front pocket usually adds 3 to 5 cm, so don't overfill the outside pockets.

What is Frontier Airlines' carry-on size limit?

Frontier Airlines' carry-on limit is 61 × 40.6 × 25.4 cm, up to 15.9 kg.

Which other bags fit Frontier Airlines?

Rimowa Essential Cabin and Away Carry-On fit with room to spare. Samsonite Freeform Carry-On Spinner and Away Bigger Carry-On are right on the limit.