I got this awsome pack this summer and used it twice for day hikes.It has plenty of room for extra water (I carried 4 liters of water for my dog--he's a big dog) and still has plenty of room for snacks and a light hoodie. The lay-out of the pack makes it very versitile.Really looking forward to doing backcountry hiking this winter. It can carry my 25 in. snowshoes or my snowboard and trecking poles with no problem, plus a 2 liter camelback bladder fits nicely.With both waist and chest straps, it is super comfortable, almost don't know its there. Best purchase since my Dakine wet/dry surf pack.Thanks Dakine! Thanks Dogfunk!