Lightweight and foldable design: The Collapsible Flask is made with a soft bottle body, making it extremely lightweight and easy to fold when empty, ideal for runners and hikers who need to save space in their gear. Flexible silicone bite valve: The Soft Water Bottle includes a soft silicone bite valve for easy squeezing and drinking, providing smooth and controllable water flow during outdoor activities. Compact size: Measures 27.5 cm x 9.5 cm x 3.5 cm (10.83 in x 3.74 in x 1.38 in), fitting comfortably into a backpack or even a larger pocket, making it an ideal companion for outdoor enthusiasts who want to travel light. Integrated dust cap: Folding Flask features an integrated dust cap design to prevent dust and debris from contaminating the mouthpiece, ensuring hygiene while being easy to carry without worrying about losing the bottle cap. Use scenarios: On long runs or hikes where space and weight matter; cycling, gym sessions, or quickday trips needing easy access to water; camping, travel, or minimalist backpacking where compact size and hygiene are important.