USWE Outlander XC 4L Hydration Pack It's like wearing nothing at all The USWE Outlander XC 4L Hydration Pack is the superlight race hydration pack developed and designed around pro mountain bike athletes originally. The pack is stripped off to go minimum on weight and to maximize the ventilation at the front. This pack has revolutionized what athletes experience when training and racing with a backpack. Before, it was all a gamble between comfort, unnecessary weight, and hassle. Now, the choice is clear with a pack that allows plenty of hydration but fits like a glove that truly doesn't bounce around. Trust us when we say this bag has loads of technology. Stop looking for a best in class bag and just pick your style/size and color - get ready to rock your next ride/run or race. The Outlander XC 4L is primarily designed for pro riders at marathon distances. But honestly, it will fit any rider perfectly who's searching for a badass hydration pack that will not cramp your style. This pack is a racer and we guarantee you will love it, no matter if you are a pro or a happy amateur rider. Features4 Liter overall volume1. 5 Liter or 50oz of hydration340g (*excl. bladder)Chest Range: 84 - 110cm / 33-43 | Uswe | Xc Outlander 4L Hydration Pack Black