Bum Bag unisex, Opasek SensiFit; Adjustable length; 1 outer zipped pocket; External elastic gel loop; Bottle holder 4D; Locking lacing to secure a flat bottle; Flat bottles included * 2 (200 ml); Elastic Mesh Power Mesh; Mesh 3D Mesh; 70D nylon ripstop material, waterproof up to 500 mm; Elastic jersey; mesh Flat Mesh, dimensions 45 x 8 cm, weight 150g