You can drink water without having to take the bottle out of your backpack. Features: Easily converts some bottle with a threaded-opening into a handy hydration reservoir. Adopts food grade TPU,PE and silicone material,safe,BPA free,durable to use. Easily attach to most water bottles with 28mm/30mm thread. Transparent hose can be adjusted as you need.Total Length: 40cm/5.5in. Handy clip to easily attach the hose to your backpack or elsewhere. Soft bite mouthpiece with dust cover,ensure have the clean water. There is a connected strip between the dust cover and bite mouthpiece,will not lose the dust cover by accident. Air valve(color by random) to prevent leaking easily. V-shaped design of the transparent hose provides fast water flow. Suitable for trekking,fishing,climbing,hiking,rafting,canoeing,boating,backpackingkayaking,cycling,etc. Specifications: Material: Food grade TPU + Silicone + PE Blue Hose Length: 80 cm / 31.5 in Transparent Hose Length: 40 cm / 15.7 in Package Size: 18 * 14 * 4 cm / 7.1 * 5.5 * 1.6 in Package Weight: approx. 128 g / 4.5 oz Package List: 1* Water Bottle Hose