The Classic Series - The Trail Runner belt comes with 4 7oz. bottles. The elastic webbing is comfortable and form fitting. There are two Velcro neoprene storage pockets and an adjustable waistband. This design has been the most widely used hydration belt in the world, which means there's a lot of history here. Fuel Belt has won more major events around the globe than all of their competitors combined. A proven favorite amongst runners of all terrains. The classic collection was first launched 13 years ago. To celebrate the last decade, Fuel Belt has upgraded to their latest revenge plastic molded holsters. These allow for super easy bottle entry and exit, taking this classic to the next level of performance.