The newest addition to the QuickStart series features an all-over hexagon reflective print that delivers standout visibility from every angle. This sleek hydration pack is perfect for runners of all levels who want lightweight storage, hands-free hydration, and enhanced safety when training in low-light conditions. Minimalist Design. Maximum Visibility. The newest addition to the QuickStart series features an all-over hexagon reflective print that delivers standout visibility from every angle. This sleek hydration pack is perfect for runners of all levels who want lightweight storage, hands-free hydration, and enhanced safety when training in low-light conditions. SUPERIOR VISIBILITY Expansive reflective hex print enhances visibility in low light so you can be seen and stay safe. MAXIMUM COMFORT Breathable mesh shoulder straps, moisture-wicking stretch fabric, and chafe-free binding ensure a secure, comfortable fit mile after mile. HYDRATE WITH EASE 1.5L QuickStart Bladder Included – Features an updated Push-Pull Bite Valve for easier drinking and removal for cleaning. Easy Access Storage – Three expandable power mesh pockets on the front straps: one flask, one stash and one secure zip pocket 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. Flask Compatibility – Front flask pocket holds up to one 20oz/591ml soft flask (sold separately) 360° Visibility – Expansive Reflective details on front and back to enhance visibility in low-light conditions Storage Capacity: 4L / 244 cu in Weight (w/o Bladder): 7.5oz / 211g Weight (with Bladder): 12.4oz / 352g