This Collapsible Water Bottle does not contain BPA and has obtained FDA certification. It is safe and hygienic, because it uses a food-grade liquid silicone bottle and a food-grade plastic cap, children can also use it with confidence. This product has excellent heat resistance and can withstand temperatures from -50 to 200C. It has leak-proof and impact-resistant properties and is very suitable for all activities and sports. Even if it is squeezed or pushed, it will be tightly sealed. Even if you put it in a backpack or computer bag, it will not leak. The 600mL portable silicone bottle is a foldable type. It takes advantage of the characteristics of soft silicone and can be folded compactly after drinking, making it easy to carry. The rotating cover can prevent leakage and has anti-leakage and impact resistance. Even if it is squeezed or pushed, it will be tightly sealed. It is also suitable for camping and picnics, mountain climbing and hiking, beaches, festivals, travel, hiking, outdoor recreation (such as running and transit) and other travel, fishing, fitness, gym, cycling, etc.