I recently bought this pack and I love it. For those of you that are used to using a hydration bladder, don't immediately dismiss this pack. I attached 2-750ml Hydrapak Softflasks to the shoulder straps and they give me 1.5l capacity with the same functionality. Since they collapse as you drink from them, you don't get the sloshing sound of a water bottle as you walk. The inflation valve that came with my pack leaked badly after a few uses, but I replaced it with a standard inflation valve from eBay for 99 cents, and I've had no problems since. Sure my pack still gets sweaty but it's more manageable with this pack.