The CamelBak Eddy+ Vacuum Insulated has a bite valve that opens by gently biting it. This silicone bite valve is connected to a straw through which the liquid rises when you suck. So you don't have to tilt the bottle while drinking. The drinking spout closes completely when you are not drinking. This version is double-walled, so that the drink stays cool for longer and the outside does not condense in a bag.