Key Features:3L/100oz Dakine x Hydrapak 30lumbar reservoir w/ quick disconnect,High-flow Blaster bite valve w/shut-offand magnetic hose clip ,Breathable Air Flow backpanel andshoulder straps ,DK Impact CE-certified Spine protectorcompatible (not included) ,Front helmet attachment loops ,Deployable armor carry straps ,Fleece lined sunglass pocket ,Dual side pockets (16L ONLY),Mesh side pocket (12L ONLY),Internal organizer pockets ,Safety light attachment ,Integrated rescue whistle .100% 450d ripstop recycled polyester (rPET) exterior 16L:976 cu. in. [16L] ,20 x 10 x 7\" (51 x 25 x 18cm] ,1.7 lbs. [.8kg].12L: 732 cu. in. [12L] ,20 x 10 x 7\" (51 x 23 x 15cm] ,1.6 lbs. [.7kg].