Backpack capacity
Backpacking packs can be 30 to 70-plus liters. To choose the right capacity, consider trip duration and the gear you’ll bring.
Backpack features
Think about the frame type, location of important pockets, padding and ventilation, among other things.
Backpack fit
Your pack should be sized for your torso length (not overall height) and hip circumference. You can try on packs at your local REI store.
Read full article: How to Choose a Backpack
