With so many packs on the market it can be hard to choose. One of the main differences between them is the back system. Either a suspended system (sometimes called a trampoline system), which is cooler as it holds the pack away from the body but can feel less stable and have less packable space, or a contact back which does what it says on the tin and feels more stable but is sweatier, or some hybrid combination of the two. Design and comfort of shoulder and hip and chest belts as well as back length are important, especially if…