This foldable water bottle is made of food grade silicone. So it is safe enough that you should not worry about its material. Foldable water bottle of us is soft and foldable, which can save space effectively and be placed in any backpack pocket without leaving creases. And It can be folded from 6.8 inches to 3.1 inches in height. It is convenient to carry it when you want to go outside, exercise or do some sports. Ideal for camping and picnics, mountain climbing and hiking, beaches, festivals, travel, and hiking. The 17oz (500ml) collapsible silicone water bottle is suitable for water or drinks from -22 degrees to 230 degrees. Don’t worry about water leakage as it seals well. Contact us now for details. Can be order under MOQ. Qty more than 3,000pcs are ship via sea.