My experiance with camelbaks has not been good as far as storing water. I'm not sure how long I kept mine full but flaky stuff, like the liner delaminated, formed. I still use and love my camelbaks but I don't leave water in for days on end. The platypus bladders work well for that. I've found old platypus bladders in bags that have had water in them for almost a year and it was still fine. Large gatorade bottles seem to work well too, for storage, because they are big and have a handle.