Whether you're out on a mission or just going on a trek, the last thing you want to worry about is staying hydrated. More than just staying healthy, having enough water can literally be a life-or-death situation. Hydration packs ensure that you can take along as much as you need to keep you going all day long. One of the best things about hydro bags is that they allow you to keep your hands free for other, more important, actions. You're able to drink while on the move, so there's no need to stop and no need to put down whatever other equipment you might be carrying. If you're in hostile territory, you don't want to have to choose between putting down your gun or getting dehydrated. In addition to storing water, many of these bags come with greater storage capacity so you can just take one pack to carry all the gear you need. Water is one of the most important items that you need to have with you, whether you're going on a fun hike or engaging in more serious activities. A pack that is made for carrying it, and for giving you easy access to it, ensures that you are ready for everything and anything.