But for most standard backpacking trips, 65 liters should be enough. A small number of dedicated ultralight hikers might find a 65 liter pack too roomy.
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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. The size used by many airlines is 56x45x25cm which is about 65l - but some airlines use far smaller - around 40l for Ryanair for example.
Is 65L backpack too big for Europe? I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag. You can always go smaller, but I wouldn't recommend anything smaller than 35L — unless you're into minimalist travel.
Is 65 liters big enough for backpacking? For most people and most hiking routes, yes, a 65 liter pack is big enough for backpacking. It's perfect for a long weekend even if your gear list isn't exactly lightweight. With a thoughtful lightweight backpacking setup it's big enough for a week without resupply.
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 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.
40L-45L: As mentioned before, 45L is about the largest your bag can be before it is no longer considered to be “carry-on” size. But this is the size I recommend for most travelers since it gives you a little extra space.
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.
edit: used the 65L unexpanded on both of my united flights as carry on, no issues either way. Probably could have squeezed it down to fit into the size guide if needed but this way I got a tiny bit of extra room in the bag and no issues closing the overhead, older united plane where the bags lay flat not on their side.
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.
Most backpackers can travel for months, if not years, with a backpack in the 40-46-litre range! It's easy to fit in a week's worth of clothes, as well as all your travel essentials. If you're clever with the way you pack, you should also have a bit of spare room for travel gadgets or bringing souvenirs home!
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.