I bought this to ensure I've got enough fluids to hydrate better.
Initially the bite valve was stuck shut but as the Camelbak website suggested if you manipulate it with your fingers a bit you'll split the silicone and it will work as designed, apparently this is a common effect of the molding process and is normal.
The bottle looks good and serves up water when expected, as long as you keep it filled ;0)
Cleaning is easy too.
not cheap but it is solid quality from a good brand.