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.
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Extended-trip (5+ nights; 70 liters or larger)
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.
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.
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.
So as stated, if your bag as packed ('condensed') does not exceed the maximum linear size as stipulated by your airline then there should be no hurdle to using an 85L backpack. The ideal volume for a backpack is a function of its dimensions. Most airlines allow carry-on luggage up to 22 x 14 x 9.
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.
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.
30-50 liters: In general, luggage that has a capacity of about 50 liters or less is sufficient for a weekend trip. There are lots of carry-on duffels, packs and bags in this size range to choose from. 50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range.
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.
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.
A 40l bag can be brought on most flights as a carry on and used as a daypack when walking around a city. An 80l bag needs to be checked and then locked in the hostel each morning.