the zéfal magnum is a drum made from low-density polyethylene which has a capacity of 1 l. perfect for long stretches by facilitating and accelerating the hydration during sport thanks to its large screw cap. features: -made from low-density polyethylene. -1 l capacity. -height of 259 mm. -opening threaded screw-cap. -it can be washed in dishwasher. -easy to press. -you can enter in the freezer.