Back-Packs have many different types and uses, there are the back-packs that kids use for school, or there is the type a camper, hunter, hiker, mountain climber, would use. There are also hydration packs from coleman, and gerber. We also have GSI back-pack kitchens. back-pack, day-packs, Exponent travel waist-pack, Exponent hydration system, Kids deluxe H2O Fanny-pack, Kids camp tote, Kids Stuff sack, Gerber Hydration-packs, GSI back-pack kichens, and much more. These Back-Packs come with, Moisture management polyester mesh, Water resistant and durable, high density ripstop polyester, and oxford weave with polyurethane coating, Hydration system capability with hydration tube exit port and internal compartment Aluminum alloy external frames.