Typically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on.
Is a 50L backpack too big for carry-on?
Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you.
Can a 55L backpack be a carry-on?
Not exactly, but generally speaking, on most domestic airlines, 50-55L packs are about as large as you can get away with if they're fully packed.
How big is a carry-on backpack?
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