I bought this Camelbak Hydrapak for our upcoming trip to Disney World. Walking around the parks all day can get tiring and hot and can make you very thirsty, but as anyone who has ever gone to a theme park, especially Disney World, getting drinks, even water can get very expensive. Also, it is good to have some sort of backpack or storage to carry around other things you might need during your trip, so this backpack/hydration pack fit the bill. It is really easy to use and it's easy to clean. It has a large opening in the bladder for putting in ice and water and the ice is slow to melt so you pretty much have cold water all day long. When I first got the pack, I wasn't sure how I'd like it because I wasn't sure how well the velcro bladder closure would work, but it works great.