A LIGHTWEIGHT 8-LITER BIKE HYDRATION BACKPACK. A sturdy staple the Session 8-liter bike hydration pack is a minimal yet fully featured pack combining the cooling comfort of a breathable back panel with airy shoulder straps. An updated recycled polyester provides a rugged and sustainable exterior on this narrow lightweight pack with two liters of vertical hydration. The pack provides plenty of storage including an organized front pocket a fleece-lined pocket for sunglasses or phone additional side pockets plus external attachment straps. The Session is a do-it-all bike pack to keep you pedaling all day. MATERIALS: - 100% 450D ripstop recycled polyester (rPET) exterior; DIMENSIONS: - 488 cubic inches ( 8L); - 17 x 7 x 3" (43 x 18 x 7cm); - 1.2 lbs. (.56kg); FEATURES: - 2L / 70 Oz Hydrapak reservoir; - Phaser bite valve; - Breathable Air Flow backpanel and shoulder straps; - External attachment straps; - Fleece lined sunglass pocket; - Internal organizer pockets; - Safety light attachment; - Integrated rescue whistle / sternum strap.