What Size Bag

Bags and suitcases

Suitcase and bag sizes, which bags count as what, and how big a bag your trip needs.

Linear inches calculatorAdd up your bag's length, width and height in inches or centimeters and see which airlines' checked bag limits it fits. Luggage sizesCarry-on, medium and large suitcases from Monos, Away, Travelpro and Samsonite: outside size, liters, trip length and weight, each from its maker. What size suitcase for my trip?Pick how long you're away and whether you check a bag, and see the suitcases Monos, Away and Travelpro list for that trip, with Samsonite's and Delsey's guides. Carry-on backpack sizeA backpack carry-on has the same size limit as a suitcase. Makers' travel backpacks, their liters and which airlines' limits each fits, with a fit check. Personal item backpack sizeEach airline's personal item size for a backpack, makers' under-seat backpacks with their liters, and a check of your own pack against every airline. Does a purse count as a personal item?Which airlines name a purse as your personal item, what else counts, what doesn't, and a check of your purse's size against each airline. Do wheels count in bag size?Most airlines here count wheels and handles in the carry-on size. Which count them for checked bags and personal items, and how much they add to a suitcase. Carry-on weight limitsWhich airlines set a weight limit on carry-on bags and personal items, what each allows, and how much of it a suitcase's own weight uses. Toiletry bag sizeTSA's quart-size liquids bag, the UK's 1 litre bag of about 20 x 20 cm, the EU's 1 litre bag, and a case for the toiletries that aren't liquids. Packing cube sizesPacking cube sizes from Monos, Away and Eagle Creek, in inches and centimeters, with liters where the maker gives them and which sets fit a carry-on. Garment bag as a carry-onAmerican takes a soft-sided garment bag up to 51 inches in total, Southwest counts one as a carry-on, and JetBlue has no closets. A garment bag against each limit. Duffel bag as a carry-onA duffel can be a carry-on or a personal item when it's within the size, measured packed. Makers' duffels against every airline, and a check for your own. Suitcase size in litersTurn a bag's length, width and height into liters with the math shown, or a liter figure into makers' suitcases of about that capacity. Packing listPick your trip length, the weather and carry-on only or checked, and get a packing list by category, with what stays in your carry-on.

Linear size limits

Length + width + height, as of October 2026
BagLimit or total
Checked bag, most US airlines62 in (length + width + height)
Checked bag, Allegiant80 in (203 cm)
Carry-on total, Delta, Alaska and Hawaiian45 in
A 28 x 18 x 11 in suitcase57 linear inches
A 30 x 20 x 12 in suitcase62 linear inches
Garment bag carry-on, American51 in (130 cm)

A bag over the checked bag limit costs an oversize fee, up to the most the airline accepts.

Where we get our information from

The limits come from each airline’s own baggage pages, read in October 2026. Checked against published data from American Airlines, Delta Air Lines, Southwest Airlines, Alaska Airlines and Frontier Airlines (plus 7 more).

See all 25 sources
  • American Airlines, Carry-on bags (aa.com)
  • American Airlines, Checked bag policy (aa.com)
  • American Airlines, Oversize and overweight bags (aa.com)
  • Delta Air Lines, Carry-On Baggage (delta.com)
  • Delta Air Lines, Baggage Policy and Fees (delta.com)
  • Delta Air Lines, Excess & Overweight Baggage Policy (delta.com)
  • United Airlines, Checked bags (united.com)
  • Southwest Airlines, Checked Bag Policy (support.southwest.com)
  • Southwest Airlines, Optional Travel Charges (southwest.com)
  • Alaska Airlines, Carry-on luggage size limit (alaskaair.com)
  • Alaska Airlines, Checked baggage fees and policies (alaskaair.com)
  • JetBlue, Checked Bags (jetblue.com)
  • Frontier Airlines, Bag Options (flyfrontier.com)
  • Frontier Airlines, What are the sizes and weight limits for bags? (faq.flyfrontier.com)
  • Allegiant Air, Carry-On and Checked Baggage Policy, Size and Fees (allegiantair.com)
  • Sun Country Airlines, Bags and Optional Services (suncountry.com)
  • Sun Country Airlines, Contract of Carriage, updated January 1, 2026
  • Breeze Airways, Bag Allowance and Dimensions (flybreeze.com)
  • Southwest Airlines, Contract of Carriage, effective September 24, 2026
  • Hawaiian Airlines, Carry-on luggage size limit (hawaiianairlines.com)
  • Hawaiian Airlines, Checked baggage fees and policies (hawaiianairlines.com)
  • Allegiant Air, Optional Services Fees (allegiantair.com)
  • Breeze Airways, Bag Pricing (flybreeze.com)
  • Avelo Airlines, Checked Bags (aveloair.com)
  • Avelo Airlines, Optional services (aveloair.com)

Elsewhere on What Size Bag

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General guidance from airline, TSA and FAA rules, checked on the date shown. Rules change, and the airline and security officers decide on the day: check your airline before you fly.