Jansport Stinger Hydration Backpack - completely redesigned and now comes with a three-liter upgraded Water Tower™ reservoir. Bite valve pocket at shoulder strap ends Hytundration organizer with headphone exit. New upgraded 3L Water Tower™ reservoir, separate reservoir section, and a large main section. New Mesh compressor pocket fits helmet. Complete with front zip pocket, Airvent Pro shoulder strap, Airvent Pro Ventilation mesh on back, and detachable waistbelt.