Our product picks are editor-tested, expert-approved. We may earn a commission through links on our site. If you’ve ever fumbled around trying to grab your water bottle on a long bike ride, or dealt with the annoyance of carrying a bottle in your hands on a long run, know there’s a much easier way to stay hydrated. For outdoor adventures, consider a hydration pack your most essential accessory. By essentially embedding your water supply into a backpack or vest, and drinking via an easy-to-access tube, you leave your hands free and your concentration solely on the activity at hand. Backpack versions of hydration packs are perfect for hikes, bike rides, and snowboarding or skiing. They allow room to pack other gear like snacks, phone, keys, even a fresh t-shirt or socks. Vests, on the other hand, can simplify the conundrum of long runs, when you need to rehydrate but want to keep your hands free and can’t deal with a backpack bouncing around. They have less storage than a backpack, but always enough room for at least stowing a smartphone. Fill up the water flask with ice water pre-workout or adventure and look for a model that promises to keep your beverage chilled if you’re battl...