Waist Packs are great for the casual hiker or biker, a waist pack stuffed into a daypack or a bottle cage is sufficient. However, if the hike goes for more than an hour or the bike ride is more than a few miles, you'll need to start adding water bottles or an H2o bladder. We offer a full range of hip packs designed to carry 1 or 2 water bottles. Anything more, however, and you'll want a hydration backpack.