Frontier Airlines: Personal Item and Cabin Bag Sizes
Frontier Airlines publishes a personal item allowance of 45.7 × 35.6 × 20.3 cm, which is 18.0 × 14.0 × 8.0 in, and a cabin bag allowance of 61 × 40.6 × 25.4 cm — 24 x 16 x 10 in, and paid on every fare. A backpack qualifies as either, provided it measures within the figure once packed.
What Frontier Airlines allows
| Personal item | 45.7 × 35.6 × 20.3 cm (18.0 × 14.0 × 8.0 in) |
|---|---|
| Cabin bag | 61 × 40.6 × 25.4 cm (24.0 × 16.0 × 10.0 in) — 24 x 16 x 10 in, and paid on every fare |
Allowances differ by carrier, by fare and sometimes by aircraft, and they change without notice. Every figure here is the one the carrier published when this page was last reviewed; check the measurement on your own booking before you fly.
Frontier gives an unusually large carry-on at 24 by 16 by 10 inches and charges for it on every fare, which makes the free 18 by 14 by 8 inch personal item the one that matters. Frontier is also among the strictest US carriers about measuring it, with sizers at many gates and gate fees that run to three figures.
This is the profile a personal-item backpack is built for: a hard limit, measured, with real money attached to getting it wrong.
Which of these backpacks fits
| Model | Dimensions | Personal item | Cabin bag |
|---|---|---|---|
| Travel Backpack 30 L | 43 × 30 × 20 cm | Fits, 0.3 cm to spare | Fits, 5.4 cm to spare |
| Vacuum Backpack 18×14×8 | 47 × 33 × 20 cm | Cabin bag, 1.3 cm over the under-seat figure | Fits, 5.4 cm to spare |
| Vacuum Backpack 40 L | 40 × 30 × 20 cm | Fits, 0.3 cm to spare | Fits, 5.4 cm to spare |
The comparison sorts both sets of figures and matches largest side to largest side, which is how a bag actually goes into a sizer. Models are listed only where the manufacturer publishes all three dimensions.
The Travel Backpack 30 L is the straightforward choice for Frontier Airlines: its published dimensions sit inside the under-seat figure with margin to spare. Pack it so the sides stay flat and a sizer is a formality.
How a sizer is actually used
A gate sizer is a rigid frame, and the bag has to go into it without being pressed. Depth is the dimension that fails first, because a soft bag packed full becomes round in the middle whatever its flat measurements say. That is the single argument for compression on a carrier that measures: air taken out of bulky clothing comes out of the depth, which is exactly where the margin is thinnest. How the box is used, and which dimension it catches, is set out in the personal item size guide.
Frontier Airlines baggage FAQ
What size is a personal item on Frontier Airlines?
45.7 × 35.6 × 20.3 cm, or 18.0 × 14.0 × 8.0 in. Check the figure on your own booking before flying, because allowances change without notice.
Does a backpack count as a personal item on Frontier Airlines?
Yes, provided it measures within the published figure once packed and slides fully under the seat in front of you. Shape matters as much as capacity.
What is the cabin bag allowance on Frontier Airlines?
61 × 40.6 × 25.4 cm — 24 x 16 x 10 in, and paid on every fare.
Does vacuum compression help at the gate?
It reduces the volume of bulky clothing, which mostly comes out of the depth of a packed bag. It does not reduce weight, so it helps with a sizer and not with a scale.