Double Anti-leak Patented DesignThe water bottle cap adopts a patented double-layer silicone sealing design instead of the traditional screw-in plastic cap. This effectively solves the common problem of water leakage in similar foldable water bottleson the market. (Have you ever imagined or experienced it? How painful it is when you want to drink water but find that the water has escaped and your backpack is wet.) From now on, this will never happen again.[The bottle cap is tied to the bottle]Are you still worried about not being able to find the bottle cap after drinking water? RNGOS adds a connecting strip between the cap and body. Since the cap is always tethered to the bottle, you can drink with only one hand (instead of holding thecap with the other) and don't have to worry about losing the cap. (The cap is lost, can the water bottle still be used?)[High-Quality Food-Grade Silicone Material] This foldable water bottle is BPA-free, odorless, and made of food-grade silicone imported from Germany. It has passed LFGB, SGS and FDA certification to ensure safe drinking and does not contain PVC, latex, or phthalates. And no odor such as plastic smell, safe and hygienic. Men, women and children can use it with confidence.[Uniquewaist-shaped design water bottle] RUNGOS folding water bottle adopts ergonomic principles. The slender design in the middle of the bottle body makes it easier to hold, more comfortable and non-slip. It can be easily held by both big and small hands. Has a morestable upright ability than an upright water bottle.Heat Resistant, Cold Resistant, Impact ResistantThis soft silicone foldable water bottle has good heat resistance and can withstand temperatures from -50 to 200C. It's leak-proof and impact-resistant,making it perfect for a variety of outdoor activities and travel. ?We do not recommend using it in liquids above 158F (70C) to avoid burning your hands.[Foldable and lightweight] Utilizing a soft silicone body, the 600ML water bottle is only 20%of its original volume after folding, and the total weight is only 155g, making it very convenient to carry. ?Allows you to replenish your body with moisture anytime and anywhere.