Premium Quality：2.5L, made of EVA, and the tube material is PVC，No Plastic smell or taste and is proven to bear the strict tests Stay Hydrated：2.5 Liter capacity provides plenty of water to keep you hydrated on any outdoor adventure，Perfect when you are hiking, cycling, camping, or backpacking Leakproof：This water bladder use well sealing technology, It has passed the air pressure test and is completely pressure resistant and leak proof Well Sealing Water Bladder: Bite the mouthpiece to suck water，Soft mouthpiece with easily accessible ON or OFF valve，It also has a cover to keep dirt out，Conveniently control the water flow by biting Notice：The screw cap should be securely closed as tight as possible to avoid potential leaking，Twist the lid clockwise to fasten it tightly until the lid can not move any further under force Mardingtop Outdoor Equipment Co.,Ltd, founded in 1986, is a luggage manufacturer with a group of professional design and development staff, and more than 500 employees. The factory, Which covers over 107,000 square feet, is situated in Canton, China. Over years, Mardingtop had designed and manufactured various types of practical and outstanding backpack, travel bag, camera case, and knapsack, etc., providing professional products for tour pals and general travelers. We sincerely hope to have the opportunity to form a long-term strategic corporation partnership with Amazon. For all this, Mardingtop will equip with an adequate facilities and professionals. Mardingtop, for the topper goal!