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.
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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. That works out to not quite 45.5 liters. So yes, a 50L pack is too big in at least one of those.
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.
How Big Can a Duffel Bag Carry-On Be? Now, let's dive into the size requirements for a duffel bag carry-on. In general, most airlines limit the size of your carry-on to around 22 x 14 x 9 inches with a capacity of 45 liters.
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.
What size should your carry-on luggage be? On domestic flights within the United States, a carry-on bag that's smaller than 22 x 14 x 9 inches (45 linear inches), including handles and wheels will meet the size restrictions of all major airlines, such as United Airlines and Alaska Airlines.
American Airlines carry-on dimensions should be no more than 22 inches X 14 inches X 9 inches (56 cm X 36 cm X 23 cm), including handles and wheels. All carry-on must fit the sizer at the departure gate. If the bag does not fit in the sizer, it will need to be checked.
Free Items to Carry OnWhether it's a duffel for an overnight trip or a roll-aboard bag for a much longer stay, arrive knowing that you can easily store your bag in an overhead bin. The faster you can stow your bag, the faster your flight will be on its way.
The 40L dimensions are 21 x 14 x 10.5 (53 x 35 x 27 cm). The depth is a little over max on many airlines which tends to be about 9”. But this bag has no frame, so the actual packed dimensions is largely determined by what you put in the bag. And if you don't pack it too full it will work fine as a carry on.
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.
The one-size-fits-all approach – a 40L backpack. Yet all being said, there is a loose one-size-fits-all approach for most travellers. The truth is that if you're looking for a versatile backpack for travelling Europe, South East Asia or even South America, a 40L backpack will (probably) be the perfect size.