Features compact and lightweight hydration bike pack from camelbak designed to hold the 2 litre antidote reservoir turn easy openclose cap dryer arms and centre baffling for a comfortable streamlined fit patented big bite valve for convenient spill free drinking action hydroguard technology pureflow tube easy clean wide mouth opening camelbak got your bak guarantee external fill through quick release front flap essentials pocket reflectivity air mesh back panel and harness with slider stern