Backpack capacity – The size of pack you’ll need is tied to the length of your trip and how much weight and bulk you want to carry.
Backpack features – These are the refinements that affect how the pack works for you.
Backpack fit – Torso length, not your height, matters most.
Well, there is one more consideration. Buy your pack from a reputable retailer with experienced personnel, who can give you good advice!
The pros at REI have all the tips. Read the full article here.
Now that you have the backpack, how do you pack it?
Or check out this article on loading your pack.