When you run #badwater135 in #deathvalley you've got to train the body to consume a lot of fluids. My "go to" hydration packs are these beauties by #ultraspire. Just got the updated Alpha 3.0 and the new Legacy. Christmas in March! They fit close to the body, don't bounce, and most of all they're easy to get in and out of with large hooks in front. Tons of storage capacity too which is great on the desert trails when water supplies are scarce. What's your favorite pack?