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.
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.
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.
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.)
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. As there is a limit on the size of your free carry-on baggage.
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.
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.
If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.
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.
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.
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.