For multiple-day camping trips, you'll want the largest packs, those that allow a capacity of 50 or more liters. These packs work great for winter weather gear, as well as tents, food, and cooking gear required for a long camping stint.
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One MIGHT get away with a 55L backpack, but 40L would be much more reliable. Carry-on limits are defined by total linear inches, typically 45 or fewer, also maximum dimensions particularly length, generally 22 inches. 22 x 13 x 9 is 2574 cu. inches, 42L.
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.)
The Farpoint 55 comes with a fully detachable dayback that gives you ultimate flexibility with your travels. Plus, it meets most domestic carry-on requirements with the main pack overhead and daypack as your personal item for far-flung adventures.
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.
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.
But bags larger than 65L are way too big for travel, even on extended trips. If you'll be traveling for more than a week or two, you'll need to do laundry anyway. You can't—or at least shouldn't—try to carry a month's worth of dirty clothes. Between these two extremes is the sweet spot of backpack sizes.
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.
Size Matters (but Bigger Isn't Better)Like a few other things in life, size matters when it comes to choosing a backpack — but not in the way you might think. Based on many years of dragging excessively large backpacks around the world, I have to say bigger is not better. You do not need an 80 or 90 litre pack.
In most cases, the compartment size may range from about 35 to 45 liters. In some cases, the bag may also have an expandable pull string storage for more space.