Black Diamond Distance 4L Hydration Vest Alloy, XS

Whether you're gearing up for race day or another long training run, the Distance 4L Hydration Vest from Black Diamond is what we recommend to give ultra-runners and trail-enthusiasts the storage they need for a long day in the hills. Smaller and more speed-minded than the other packs in BD's Distance line, this vest still has lots of hydration storage and an over-the-shoulder trekking pole carry.