A: Yes it will fit underneath an airline seat. A: it depends on the airline. For southwest, it's allowable as a carryon but not as a personal item that fits under a seat. They state that it must fit 16.25” (L) + 13.5” (W) + 8” (H).
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For international or budget airlines, choose a bag under 40L. If you want to pack ultralight, anything 35L or under can be carried on virtually any airline. Dimensions: The common 45L volume is usually measured as 22 x 14 x 9 inches. You might also see a limit of 45 linear inches.
While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.
As a general rule of thumb, anything smaller than the dimensions of a carry-on can be considered a personal item. However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches.
Likely such a bag would be 21 -22 inches long, and so be 3–4 inches too long. A maximum under seat bag would be about 18 x 14 x 8 inches, 2016 cubic inches. With 61 cubic inches per liter, maximum under seat size would be about 33 liters.
The 40L will max out carry on dimensions on most airlines so you never have to check a bag. For stricter airlines, like RyanAir, 30L will be a better choice.
A weekend backpack like a standard 40L backpack is big enough to carry a backpacking sleeping bag, small tent, and pad, as well as extra clothing and layers.
Is a 50L backpack too big for a carry-on? Yes. The usual maximum dimensions for carry-on luggage are 9 inches x 14 inches x 22 inches (22 centimeters x 35 centimeters x 56 centimeters). This is 43.12L, so your 50L backpack is about 16% too big.
Is my backpack too big for plane? In general, your personal item should be smaller than your carry-on and under the specific airline's carry-on dimensions, allowing it to fit under the seat in front of you. In most cases, backpacks are considered personal items as long as they fit under the seat in front of you.
Personal itemsThese items must fit under the seat in front of you, so they must be 9 in x 10 in x 17 in (22 cm x 25 cm x 43 cm). Common things include purses, backpacks and laptop bags.
Their dimensions also often fall under the maximum carry on requirements for peace of mind when traveling light. We recommend using a 30 liter backpack carry on as its often just the right size for airline bag requirements.
A 45L bag maximizes overhead space but can get heavy when fully packed; 35L bags tend to be more manageable. Clamshell designs open like a book and are easiest to pack, but bags that open traditionally tend to have more structure.
It is rare for airlines to weigh your carry on or hand luggage. So long as your bag is not clearly overweight, and you're able to carry it with ease – you shouldn't have any issues with a slightly overweight bag.
Airport workers use linear dimensions to decide whether your bag is legitimate. Clerks will use a measuring tape to gauge any luggage's height, width and length. They then calculate the sum total of each measurement and get linear inches.