Arete 18 (1.5L) RucksackSuitable for any outside adventure, whether it be your daily commute, evening run or weekend hike, Camelbak's Arete 18 (1.5L) Rucksack is a minimal, ultra-light hydration pack built for any occasion. Camelbak's Arete 18 (1.5L) Rucksack features a 1.5 litre Crux Reservoir that delivers 20% more water per sip alongside an ergonomic handle for easier refilling and a clever on/off lever that makes it easy to prevent leaks. It is also complemented with a spacious interior with multiple pockets for layers and essentials, as well as a removable sternum strap for a custom fit and compression straps to remove bulk. Plus, when you are not wearing it, it reverses into an insulated reservoir sleeve which is perfect for holding your water supply steady inside a larger pack.Features:The Crux Reservoir delivers 20% more water per sipErgonomic handle for easier refillingOn/off lever that makes it easy to prevent leaksRemovable sternum strap for a custom fitSecure zippered pocket for essentials; Side stretch pocketCargo compressionReversible design converts into an insulated reservoir sleeveMade from ultra-light materialsTorso fit: 38cm - 53cm / 15in - 21inCargo only: 16.5L / 1000 cu in; Total capacity: 18L / 1090 cu in; Pack weight: 300g / 11ozBuy Camelbak from Chain Reaction Cycles, the World's Largest Online Bike Store.