It's all here: how to pick a pack that fits your needs, and your back. And equally important: how to fit your stuff in that pack.
What to look for when buying a backpack. Information about use, design features and construction, suspension systems, sizes, and pack fitting.
Backpack Fitting is the most important factor in pack selection. Not all packs fit all bodies, and an ill-fitting pack will spoil the fun of being on the trail.
Women's backpacks are designed to fit slightly shorter torsos and generally narrower shoulders.
Before packing your backpack, spread everything you plan to take on the floor in front of you. Leave behind those things you may not really need, and make sure you haven't forgotten any essentials.