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.
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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 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.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night.
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.
70L is definitely too big. I believe the 55L is a 40L + a 15L daypack. This will probably work, but double check the length, width, and height, and make sure none of those dimensions are larger than allowed for a carry on.
Each airline sets its own guidelines for the maximum allowable size for carry on luggage . Most airlines allow bags up to 45 linear inches (length + width + depth) or 22? long, 14? wide, and 9? deep. To prevent problems at the airport, your bag should be no larger than these dimensions.
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. Dimensions: The common 45L volume is usually measured as 22 x 14 x 9 inches.
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.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night. (Larger packs can more comfortably accommodate extra clothing, a warmer sleeping bag and a 4-season tent, which typically includes extra poles.)
Carry-on Luggage Size MattersGenerally, most of the European airlines limit carry-on luggage to a maximum size of 55 x 40 x 20 cm ( 21.6 x 15.7 x 7.8 in); however, a few airlines do accept bags up to 25 cm wide (9.84 inc) or do not accept more than 35cm tall (13.7 in).
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 70L pack size has enough space for 7-10 days of food and ultralight gear. The pack can be compressed down with the roll top and side compression straps for short trips or use the top strap and base straps to lash extra stuff to the outside for long carries.