Features Hydration: Two 14oz / 414ml NATHAN x HydraPak QuickStart Soft Flasks included with a Push-Pull Bite Valve for easier drinking and removal for cleaning Fit: Unisex One Size Fits Most - Designed with adjustable front and side straps to comfortably fit a wide range of body types Easy Access Storage: Four expandable power mesh pockets on the front straps: two flasks and two stuff pockets Rear Capacity Storage: Large back pocket and separate bladder compartment with hook and loop keepers to keep bladder secure, plus hose exit points at either shoulder Expandable Gear Carry: Rear stretch mesh pocket fits layers, gear, and larger essentials, plus an elastic pole keeper Bladder Compatibility: Bladder compartment holds up to a 1.5L bladder (sold separately) 360° Visibility: Reflective details enhance visibility in low-light conditions Storage Capacity: 4L / 244cu in Weight w/o Flasks: 7.4oz / 211g Weight with Flasks: 12.4oz / 352g