Key Features (5L):2L / 70oz Dakine x Hydrapak 30 lumbar reservoir ,Phaser bite valve,Magnetic buckle auto-locates hydration hose ,Breathable Air Flow backpanel ,Internal organizer pockets ,External attachment straps ,Padded waistbelt w/ zippered phone pocket ,Side compression ,Safety light attachment .100% 450d ripstop recycled polyester (rPET) exterior305 cu in.[5L] ,12 x 7 x 4.5 [ 30 x 18 x 11cm] ,1.2 lbs. (0.5 kg].Key Features (2L):Breathable air mesh backpanel ,Two deployable side water bottle pockets ,Internal organization ,Padded, fleece-lined, zippered phone pocket,External attachment straps .100% 450d ripstop recycled polyester (rPET) exterior 122 cu. in. [2L] ,10 x 7 x 3\" [25 x 18 x 8cm] ,0.6 lbs. [ 0.3 kg].Key Features (1L):Breathable air mesh backpanel ,Deployable side water bottle pocket ,Internal organization ,Padded, fleece-lined phone sleeve ,External attachment straps .100% 450d ripstop recycled polyester (rPET) exterior 61 cu. in. [11],7 x 5 x 3\" [17 x 11 x 7cm] ,0.4 lbs. [0.2 kg].