Product Specifications: Model = 2 Liter 70 oz PEVA Bladder -Color: Blue -Material: BPA-Free PEVA; -Tube Size: 100 x 1cm / 40” x 0.4” -Weight: 150g Product Features: – Fits Most Hydration Backpacks-Molle & Tactical Vests, Use As A Replacement Or For Adding Hydration To A Compatible Pack. – Superior Quality – A Favorite With Military, Law Enforcement, Hunters, Hikers And Outdoor Enthusiasts. – Good Performance in compression resistance and anti-burst. Important Notice: – The temperature of the water should be between -20 and 50 degree Celsius. – Hydration Bladder cannot hold juice,milk,soft drink,liquor, etc. – Please soak the bladder for one hour in the warm salt water about 30-40 degree Celsius and then clean it before using.(The salt concentration should be controlled at about 7%.) – Clean with a mild detergent and rinse the reservoir thoroughly. – Make sure it is completely dry, inside and outside, before storing. – Avoid contact with extreme heat/cold, harsh chemicals, UV light and sharp objects, these elements will damage the reservoir. OUR SERVICE 100 % Satisfaction Guaranteed. If you have any questions, please feel free to contact us at any time, we’ll provide our best service to resolve the problem.