50 pounds is the usual weight limit. The largest checked international luggage size allowed is 62 linear (total) inches. Typically, a standard checked luggage size wavers around 27 x 21 x 14 inches. The universally accepted carry-on luggage size for a domestic flights (within the U.S.) is 22 x 14 x 9.
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For example, if your bag is 24 inches tall, 20 inches long and 18 inches wide, its total linear length is 62 inches.
Conclusion. So while 29-inch suitcases will be permitted by most airlines depending on their size and weight limits, other carriers may not permit them at all — so always check with your airline before flying to avoid any unnecessary delays or fees at the airport gate.
A lot of manufacturers advertise their 28-32 inch suitcases as checked luggage. However, technically, that's false advertising. The truth is that a large portion of 28, 29, 30, 31, and 32-inch suitcases are over the size limits for checked bags, so they can't be used as checked bags.
It's calculated by adding together the outside length, width, and height of a suitcase or bag. For example, if your bag measures 24 inches long, 18 inches wide, and 20 inches high, its linear inches would be 62 (24+18+20=62).
If you go on a 2-week trip to Europe, there is a good chance you'll need at least a 25” suitcase, and perhaps even bigger 28” luggage will be more suitable. Still, within these suitcases, you want to choose one that weighs the least.
Carry-on Luggage Size MattersGenerally, most of the European airlines limit carry-on luggage to a maximum size of 55 x 40 x 20 cm ( 21.6 x 15.7 x 7.8 in); however, a few airlines do accept bags up to 25 cm wide (9.84 inc) or do not accept more than 35cm tall (13.7 in).
A hardshell suitcase is typically better than a softside bag for protection (as long as your items are packed safely inside, too). However, all hardshell materials are prone to getting scuffed, scratched, or possibly cracked more so than with fabric suitcases.
Domestic carry-on policies. A good rule of thumb is that if your carry-on bag fits under the seat in front of you, it's considered a personal item. This includes small backpacks, purses, briefcases, laptop bags, etc. Larger bags, including suitcases, must fit in the overhead bin compartment.
Because suitcases need to fit into certain spaces (overhead compartments, under the seats, etc.), they're always measured at the widest end of each dimension. This usually includes spinner wheels, side and top handles, and anything else that's “sticking out” of the main frame.
Most airlines seem to have a 62 linear limit (L x W x D) on checked luggage before incurring additional fees. Suitcases seem to be sold in 20, 24, and 28 sizes. The 28 bag comes the closest to the 62 limit but almost every 28 bag I've looked at had linear measurements of between 64-65.
Definition of Linear InchesFor example, if your luggage measures 28 inches in length, 14 inches in width, and 20 inches in height, you would add those numbers together: 28 + 14 + 20 = 62 linear inches.
Large lightweight suitcases (28 -30 inches) usually weigh between 8.5 – 13 pounds (3.9 – 5.9 kg). You can find lightweight suitcases that weigh even less than shown in the above table. You can for example find 30-inch suitcase that weighs only 7.9 pounds (3.6 kilos).
All checked suitcases need to be below 62 linear inches in size (height + width + depth). If you're looking for a checked suitcase that isn't oversized, look for 24, 25, 26, or 27-inch checked luggage.
Yes, you can check a 28-inch suitcase as long as it does not exceed the weight limit set by the airline. In order to be accepted as standard checked luggage the weight should be within the limit of up to 50 or 70 lbs. That being said, some airlines will accept oversized bags up to 126 linear inches (320 cm).
Your bag will have to fit into the sizer for it to be approved as a carry-on. Having a flexible fabric bag is advantageous in this situation because you'll be able to squeeze it in even if it's slightly oversized. Usually, many airlines won't check every carry-on but will instead go for ones that look oversized.