A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books
A backpack is a bag with straps that go over your shoulders, so that you can carry things on your back when you are walking or climbing. = rucksack
A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person's back when hiking, or on a students back when carrying books
A specially designed saddle-bag worn by a Service Dog, to assist in carrying the dog's water dish, clean-up materials, identification, door-opening devices, literature, and other small items needed by the dog and his partner SSD designs and produces its own backpacks and harnesses
a bag carried by a strap on your back or shoulder hike with a backpack; "Every summer they are backpacking in the Rockies
a ball carrier, like a harness or belt To be worn in a game to carry extra ammo at the players disposal Carries a variety of paintball tubes, which hold the paintballs There are many different kinds of packs