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.
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The rule of thumb for maximum size for carry-on is 40L with some 45L also meeting the requirements. Bags that are 55L with 15L day bag are also good since the day bag is used as a personal item making the 55L into a 40L for the overhead.
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.
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.
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.
The Farpoint 55 comes with a fully detachable dayback that gives you ultimate flexibility with your travels. Plus, it meets most domestic carry-on requirements with the main pack overhead and daypack as your personal item for far-flung adventures.
But, based on my own experience, 70L is too large for a carry-on item with most airlines. If you're looking for the optimal balance between the largest bag possible, and the most airlines it would be allowed on, I find that 35L (53x35x20-cm) is allowed on 155 of the 175 airlines I could find data for.
40-50 LitersBackpacks falling around the middle of this range (around 45L) can also be used in place of suitcases when traveling internationally. You can expect to fit the following in a 40-50L backpack: 2L water bottle. 2 hoodies or a lightweight jacket.
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.
65 cu liters is 3966.5 cu inches and 85 cu li is 5187 cu inches...so I'd say 65 liters is pushing it. You'd need to check the dimensions or go with something like my ebags weekender convertible. but it does not have all the cinches/straps as a regular backpack might have.
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.
Is 50L backpack big enough? 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.
What is this? Ryanair say the size of the free small carry-on bag is 40 x 20 x 25cm and can be a maximum of just 20 litres and I quote from their website 'must be able to fit under the seat in front of you.
Can a 60L backpack be a carry on? Yes, a 60L backpack can be taken as a carry on. But since it is a larger bag, you will most likely have to pay extra depending on the airline.
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.