Soft Flask Material and safety The Soft Flask is made from BPA silicone and TPU for durability and flexibility. It is safe for use and designed to withstand regular use during outdoor activities. Odor management and care bottles may have a slight odor. To reduce odor before first use, fill the bottle with rice water, green tea, sugar cubes, or vinegar and rinse. Washing with baking soda is also recommended. Temperature range for use is 040 C. Cap, cover and compatibility A dustproof cover is attached to the drinking cup. The Soft Flask is suitable for use with running belts and hydration vests. Drinking performance The bottle is a light squeeze design with a flow bite valve that autoseals after each sip, preventing leaks. Even with limited suction, you can rehydrate easily. Space saving and durability Compact and durable, the Soft Flask stands upright when full and shrinks to a minimum volume when empty, reducing any burden during activity. Comfort and usability Flexible soft material fits snugly in pockets. The flask compresses as you drink, minimizing splashing. The remaining water level is easy to judge at a glance. Use scenarios Running on road or trails: lightweight, easy to carry in a belt pocket or hydration vest. Cycling or gym workouts: quick hydration with a leakproof bite valve and compact form. Hiking or travel: collapsible design for easy packing and adaptable capacity through the day.