As someone who used to travel half way around the world twice a year, I know how onerous a task it can be picking a bag. The wrong size or shoddy construction can spell disaster with a capital D if your bag does not stand up to its intended purpose. Bags come in all different shapes and sizes; you have simple two pocket backpacks, large duffel bags, load-bearing tactical backpacks, and messenger-style shoulder bags. They aren’t created equal either. Your Jansport from high school won’t work for a hiking trip in the Rockies. Whether you are picking a bag for your bug-out gear, a weekend camping trip or for every day carry—you must consider size, shape and capacity. You’re bound to find one that fits your needs from everyday carry to a weekender from Cheaperthandirt.com’s five top selling backpacks.