Features: Compatible hydration vest fits easily into most hydration vest, belt or pack pockets. Provides no-jump stability and a flexible balloon shoulder to prevent friction. -Folding flask-premidium material conforms to any pocket, and shrinks as you drink to reduce movement and pack easily when empty. Ultralight hydration - makes an excellent addition of hydration or replacement for distance running or trail running. -Durable-made of soft Silica gel, simple-to-flow high-flow bite for valve after each sip, eliminating irritating drips. - bpa & pvc free-no strange taste, and no harmful chemicals. Specifications: -Material: silicone -Color: Blue/Green/Rose Red -Temperature: Recommeded 0 ~ 40 -Specification: 500ml Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Pcs Water Bottle.