Can be folded into a very small-sized object, and placed in waist bag, chest bag, bum bag, backpack, almost anywhere. Features: Light compact collapsible soft bottle for easy use, storage and convenient to carry. Soft bite valve, higher flow rate, wide mouth, easy drinking. Constructed with anti-microbial TPU (thermoplastic polyurethane) for superior durability and flexibility. Reusable, BPA-free, PVC-free. Wide mouth design, convenient to fill with water. Suitable for running, walking, cycling, mountaineering and other outdoor sports. Specification: Material: TPU Color: Blue / Dark Green(Optional) Capacity: 500ml / 250ml(Optional) Water Temperature: 0-40 Size: 255* 95mm / 10 * 3.7in, 240 * 75mm / 9.4 * 2.9in Package Size: 32 * 10.5 * 2cm / 12.5 * 4.1 * 0.7in Package Weight: 38g / 1.3oz, 32g / 1.1oz Package List: 1 * Water Bottle