Checked bag size and weight limits

The standard checked-bag allowance on most airlines is 62 linear inches (157 cm) total and 50 pounds (23 kg). Linear inches means height plus width plus depth added together — wheels and handles included — not any single measurement. A 28-inch suitcase that measures 30 x 20 x 12 comes to 62 linear inches exactly, which is why 28 inches is the largest size most brands sell.

Both numbers are enforced, but differently. Size is checked rarely and by eye; weight is checked every single time, because the bag goes on a scale at the counter. That asymmetry is why the overweight fee is the one most travelers actually pay.

The standard, in both units

These are the common industry figures and match the published economy allowance of most major US carriers. Allowances differ by airline, route, cabin and status — confirm on your carrier's baggage page before you fly.

How to calculate linear inches

Measure the three external dimensions at their widest points, wheels and handles included, then add them. A case listed as "28 inch" refers only to its height, so the arithmetic matters:

• 30 in (height with wheels) + 20 in (width) + 12 in (depth) = 62 linear inches — legal.
• 32 in + 21 in + 13 in = 66 linear inches — oversize, and charged as such.

This is also why the expansion zipper is a trap on a checked bag. Expanding a large case adds two inches of depth, which can push a compliant bag over 62 linear inches — and it adds volume you then fill, which pushes you over 50 lb as well.

The weight limit is the one that costs money

Overweight fees are steep and scale sharply: carriers commonly charge a substantial flat fee for 51–70 lb and a much larger one for 71–100 lb, per bag, each way. Two overweight bags on a round trip can cost more than the suitcase did.

The defense is arithmetic you do at home. A large hardside checked case weighs roughly 9–12 lb empty; a lightweight softside can be 7–9 lb. On a 50 lb allowance that empty weight is between a fifth and a quarter of your budget before anything goes in. Buying two pounds lighter is two pounds of clothes you get to bring — the same logic as our lightweight carry-on picks, scaled up. Weigh the packed bag on a bathroom scale before you leave: stand on it holding the bag, then subtract your own weight.

Why the biggest suitcase is usually the wrong buy

A 30- or 32-inch case is legal on size only in some configurations, and it is almost impossible to fill without breaking 50 lb. Clothes are light and bulky, so people fill the extra volume with heavy things — books, shoes, liquids — and hit the weight ceiling long before the space runs out. A 28-inch case that maxes out at roughly 62 linear inches is the practical sweet spot, and a 25–26 inch medium is genuinely easier to keep under 50 lb.

If you need more capacity, two medium bags beat one enormous one: you stay under both limits, the bags are liftable, and you can check one and leave one home on shorter trips. Our best checked luggage picks lead with empty weight for exactly this reason, and a matched luggage set gets you the medium and the large in one purchase.

Before you fly: a four-step check

1. Confirm your specific allowance. It changes with airline, route, cabin and frequent-flyer status.
2. Weigh the packed bag at home. Airport scales are the only opinion that counts, so build in a two-pound margin.
3. Keep the expansion closed unless you have measured the expanded bag.
4. Move heavy items to your carry-on. Shoes, chargers and books cost nothing in a cabin bag on US domestic routes, where cabin weight is rarely limited.