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.
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The best carry-on travel backpack sizeYour 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.
All bags from 30L-45L meet TSA carry-on regulations for all commercial flights. The 60L duffel meets TSA carry-on regulations for most commercial flights.
Carry-on is measured by weight and dimensions, not volume. With that said, a typical 50L will not fit within the dimensions most airlines allow for carry-on. 50L is fairly big backpack, bigger than many suitcases.
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.
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.
Capacity 50L, size 23.6*13.2*10.2 inches. Duffel bag has a large space that can hold a multitude of items, including clothing, bedding such a sleeping bags and ground pads, workout gear, baby playpens, groceries, and much more.
Bottom Line. Is a backpack a carry on? In many cases, as long as it's not larger than about 55L, yes, you can use many backpacking backpacks as a carry on. Or, if you want to check extra gear like tent stakes and trekking poles, check it all.
The Average Traveler: 30-40 LitersFor the average traveler who likes to have some clothing choices and prefers to bring a few extra items, a carry-on luggage with a capacity of 30-40 liters is usually sufficient. This allows you to comfortably pack clothing for multiple days, including shoes and toiletries.
Carry-on bags are limited to 22 inches long, 14 inches wide and 9 inches high including wheels and handles. All three measurements shouldn't add up to more than 45 inches.
Some airlines also publish weight limits. Volume: A 45L backpack is the maximum-sized carry on allowed on most US airlines. 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.
All 40L Tortuga travel backpacks fit within the dimensions quoted above (22 x 14 x 9?), so you can stay carry on compliant. Carry on backpacks in the ~35L range will be better for airlines with stricter requirements.
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.
50 liters is considered as the sweet spot for backpacking trips up to 2-3 days. 65 liters is sufficient up to a 5-6 days, or almost a week if you tend to pack very little.
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.
Anything around the 40-45 liter mark should still be carry-on compliant depending on the dimensions and the airline. They make for great travel bags where you don't want to check in luggage. Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend.
The design of the 70L is perfectly suited for airplane carry-on or check in, and the features of the 70L are perfect for any adventure once you arrive at your destination. Being able to compress the 70L allows you to use it as carry-on for all major airlines in the US and Canada.