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 na 2 litre reservoirexternal fillessentials pocketreflective stripharness air mesh with slider stern