Tips on selecting backpacks Consider the size, weight, shape, materials, pockets, hydration and attachments. For tips on how to pack your backpack, look here. Hydration Packs A Hydration packs primary purpose is to carry water. Most have additional pockets and features. CamelBak 2017 HydroBak Features: Crux bladder delivers 20% more water per sip, with an… Read More Backpacks