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.
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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.
Size and Weight RestrictionsTypically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on. Any bag within this dimension can fit most aeroplanes' overhead compartments.
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.)
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.
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.
For example, American Airlines requires that the sum of three sides does not exceed 36 inches (92cm), and Northwest Airlines requires that it does not exceed 15 inches × 11 inches × 6 inches ( 38 cm×28 cm×15 cm). Therefore, if you bring a 60L backpack, don't pack it too full.
75L is a fairly large backpacking rig, especially loaded, even with lightweight space age ultra-costly materials - Pretty sure its not going on board - you're going to have to pony up for checked baggage bud.
The extra weight can distort the natural curve of the middle and lower back, causing muscle strain. Members of the UI Hospitals & Clinics Rehabilitation Services team recommend you carry no more than ten percent of your weight in a backpack.