Typically, three-day packs are marketed in the 30-50 liter (1830-3050 ci) size. You'll want something that can effectively hold all the equipment you'll be carrying. This will include your food, shelter, sleeping, and clothing equipment.
Most airlines allow carry-on luggage that measures up to a maximum of 22 x 14 x 9 inches. Regarding volume, backpacks that are 40-45 liters are good as a carry-on. Anything bigger than that might require you to have it checked in instead.
The primary purpose of a tactical backpack is to store your gear and make it easier to carry. Just as important, however, is how you get to your gear. There are many other access and opening styles a tactical backpack might have.
Unlike many other backpack categories, tactical backpacks offer lots of utility for various activities, including long hikes, military deployment, traveling, and cycling. Good tactical backpacks have numerous pockets, compartments, and clever features.
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