Camelbak classic hydration packthe camelbak classic hydration pack is the quintessential bike hydration pack with the convenience of external fill via the quick release flap on the front of the pack.the camelbak classic holds the industry leading 2l antidote reservoir and features one small zip pocket at the front to hold keys and other essentials.featuresmaterial 210d nylontotal capacity n a 2 litre reservoirexternal fillessentials pocketreflective stripharness air mesh with slider sternum strapback panel air meshtorso length 33cm1 4 turn easy open close caplightweight fillportdryer armscentre baffling and low profile designpatented big bite valvehydroguard technologypureflow tubeeasy to clean wide mouth openingdesigned to carry multi tool, wallet, extra layer, keyscamelbak got your bak guarantee if camelbak built it, camelbak will bak it with their lifetime guaranteeweight 190g pack onlybuy camelbak accessories from chain reaction cycles, the world's largest online bike store.