Mazama Designs Sidestream Go, 1.3 Liter Waist Running Nordic and Stand Up Paddle Hydration Pack with Retracting Drink Tube Retracting drink tube for hydrating without slowing down or taking your eyes off the trail No bounce fit, rides in the small of your back close to your center of gravity for a stable, no slosh fit Insulated BPA-free bladder and drink tube to keep you and your fluid cooler longer 1.3 L (45 oz) fluid capacity offering enough fluid for 1-2 hours of activity, more volume than a bottle, less weight than a full-size hydration pack bladder worn on the back Top-fill bladder for quick and easy filling without removing the bladder from the pack