Features: Streamlined and Compact Design: 19.7”x8.7”x2.6” in size. Ergonomically fits for your shoulders, chest, and waist. 3 straps are all adjustable for reducing bounce. Soft air mesh back speeds up air-flow and makes your back cool. Foam padded shoulder straps are extremely comfortable. Reliable Material: Heavy duty 1000 Denier water repellent nylon with superior wear resistance. Engineering plastic buckle is durable and impact resistant; Military grade webbing is strong, anti fading; SBS brand zipper is reliable and long lasting. Practical Functions: 1 main pocket fits up to 3L water reservoir with either large or small opening. 2 external pockets for storing personal belongings wallet, gadget, towel, phone, keys. The MOLLE system allows you to carry more items. Professional 3L Hydration Bladder: Made of BPA free, tasteless TPU. Quick release valve allows you to refill water without connecting hose. Large opening is easy to clean and add ice cube. 360 degrees rotatable mouthpiece allows for easy drinking. Shut On/Off valve helps to adjust water flow. Middle baffle keeps the bladder flat and makes it easier to place into the backpack. Versatility: Frees your hands while drinking, this tactical hydration pack is your perfect choice for short trip, camping, bike riding, walking, mountaineering, kayaking, skiing, snowboarding. A decent Holiday Gift for families and friends who love outdoor sports. Cleaning: Before the first use, fill the bladder with dish soap or baking soda and warm water, run the liquid through the tube and mouthpiece, let them sit for 2 hours and then pour out the liquid. Rinse them all several times with only water and let them air dry. Storage: Empty the water, rinse clean and make sure it is completely dry before storing. Uniqueness of Tactical Hydration Backpack: Cloth, buckle, zipper and webbing are all made from the high-grade material, sturdy and durable. Cloth is water resistant to secure your gears inside. Main pocket can hold either large or small opening water bladder, compatible with most of bladders on the market. Two external pockets are used to place personal items T-shirt, toiletries etc. The MOLLE suspension system expands to attach more items. Shoulder, chest and waist straps can all be adjusted to your comfortable size, keep the pack snug to your back. Three breathable mesh pads at the backside make rapid air flow, while even the weight to your back for ultra relaxed carrying. Well-designed Leak Proof 3L Hydration Reservoir: Quick Release Valve: No longer need to hold the long hose to fill water, just detach the hose to fill water easily. Both reservoir and thermal insulated hose are made from TPU that is cleaner and more resistant to bending than ordinary PVC material. With Large 9 cm diameter water inlet, easy to clean, fill water and add ice cube. Mouthpiece is 360 degrees rotatable to drink easily. With middle baffle keeps the bladder flat and makes it easier to place into the knapsack. Stylish and Sleek Appearance Ergonomic design provides extra body hugging comfort and eliminates bounce and movement. Fits for 27 to 50 inches chest. It will last years of use. Multi Occasion Use Not only does it carry water, but also store your essential items, ideal for a day excursion and sports that you need to focus attention. Your Satisfaction is All for us Take our tactical water pack with your next adventures, we will be with you to enjoy the wonderful outdoor sports! Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.