The CamelBak ChillBak 30 Backpack Cooler is the latest innovation to keep your crew well hydrated. This backpack cooler Includes the 6 L fusion group reservoir with TRU zip waterproof zipper that stows conveniently behind a zippered back panel. It keeps your items cold for 70 hours, and retains ice for 48+ hours, while its padded backpanel and shoulder straps keep it comfortable to carry wherever you go. Keep your party going strong with the CamelBak ChillBak 30 Backpack Cooler!