110 ounces of cool, refreshing, drip-free hydration. This is one of the best purchases I've made in years! If you ever do long distance day hikes, then this is a must. With it's own pack and shoulder straps, the gregory hydration bag and a fanny pack will carry me over 20 miles without having to stop for filtering or fumbling for water bottles. For backpacking, I just remove the bladder and insulation pouch (yes, insulation!) and tuck it neatly in the top pocket of my pack. The insulation has kept my water cool and crisp all day long in 90 degree scorchers. Want to go-lite? Ditch the insulation and now your in fast pack mode. I love this thing! Oh yeah, it's also perfect for downhill skiing, cross country skiing, and mountain biking. I might start wearing it during work!

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Never needed them. Gregory lasts forever.

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Nalgene water bottles. Oh the error of my thirsty ways.