Made from a ripstop nylon, the pack not only repels water to keep your gear shielded from the elements but allows you to repair small rips and punctures on the go using only the heat from your fingertips. That is, when your encounter small holes in your bag, all you have to do is rub your fingers around the puncture, applying some pressure and body heat to it, and the surrounding material will tighten, re-sealing the hole like magic. Of course, there are limitations to this feature regarding tear size, but for small punctures from pointed objects, it’s a great way to maintain the integrity of your bag for years to come.