Backpacks take all the stuff that would normally hurt your arms to carry and strap it to your back. So you can keep carrying heavy stuff while leaving your arms free to pick wildflowers or swat away mosquitos or try in vain to fight off that bear that ambushed you on the hiking trail because you're walking around with all your food on your back like a sentient ravioli. Pretty ingenious, right?
High Sierra Sport Company official site