Feature: -1L/1.5L/2L/3L water bag, the ultimate remedy against dehydration -Thanks to the plug-and-play system, the mouth is opened, and the specially designed on/off system can firmly close the valve during the journey, so that water can be easily and quickly refilled -37 inches long flexible tube, compatible with all Aonijie backpacks, side outlet, nozzle protection sheet -Does not contain PVS, bisphenol A, TPU (thermoplastic polyurethane) materials Specification: Brand: Lighten Up Material: TPU, PP, PEVA Color: Blue Capacity: 1L;1.5L; 2L; 3L Straw length: 37inch Application: running/hiking/biking/climbing/camping Recommended water temperature: -20°C to 50°C/-4°F to 122°F Package Contents: 1x water bag