1x 2.5L Large-caliber Water Bladder Pack Hydration System Camelbak Hike CampFeatures - Safe non-toxic TPU material. - Compressive resistance to abrasion. - Tube connected to the bottom of the bladder. - Can be put into backpack and backpack's shoulder strap. - Foldable design， easy to carry.Specifications - Capacity: 2.5L　 - Material: non-toxic TPU - Type: large-caliberPackage Includes - 1x 2.5L Large-caliber Water Bladder Pack Hydration System Camelbak Hike Camp