A reliable knife is the number-one tool for any outdoorsman. Most of us own so many that it’s often difficult to decide which one to take into the field, and we often end up taking multiples. But if you carry only one blade, a folding knife offers the best bang for your buck. It may not be as durable as a fixed blade, but a folder’s light weight and small size make it more likely you will pack it everywhere you go. Here’s what to look for in a great folding-blade knife.