EarlyBirdSavings 2.5L Hydration Water Bag Bladder Pouch Reservoir S for Camping Hiking Climbing Bite Valve Cover keeps Bite Valve clean from dirt Water Inlet Dia.: 4.5cm / 1.8". Capacity: 2.5L Can be put into backpack and backpack's shoulder strap Safe non-toxic TPU material. Compressive resistance to abrasion Bag Size: 45 x 19cm / 17.7" x 7.5" (L*W). Tube length: 1.05M / 41.3". Weight: 154g. Material: Non-toxic TPU