*Features*: *Comfortable Wearing Hydration Vest*:Designed with polyester mesh fabric,our running backpack provides excellent air circulation and breathability to keep your back cool and comfortable. Soft shoulder straps prevent your skin from abrasion,and .38lbs lightweight effectively reduces your running burden. *Water Bladder Capacity Combination*:Come with different sizes water bladders,retain liquids without any leakage. 1.5L large water bladder support your long time running,you can freely choose which water bladder you desire on your running,and they can be easily store in the pocket. And water tube allows you to drink more conveniently. *Multiple Storage Pockets*:Our running hydration vest is equipped with multiple storage pockets,store your outdoor necessities,like keys,wallet,sunscreen,phone,towel,or any other items. You can quickly get what you need from front pocket,or you can place your phone securely in the rear pocket with smooth zipper. *Considerate Reflective Trim*:Consider your safety at night,we design unique reflective trim to attract driver’s attention,and one whistle for you to warn in some dangerous conditions. Ensure your safety,make you to run faster and farther. *Fit For More People*:This lightweight running backpack has adjustable straps in waist and chest,which can be personal modified to fit for different figure. Keep you away from terrifying bounce and shake. Ideal assistant for diverse outdoor activities,like marathon,jogging,trail running,riding,etc.. *Specifications*:  Product Type: Running Hydration Vest  Material: 90% Polyamide+10% Polyurethane, Polyester Mesh Fabric, PEVA(Water Bladder), PVC(Water Tube)  Color: Black/Grey/Blue  Storage Capacity: 5L  Storage Bag: 6  Water Bladder: 2  Water Temperature: 0-40°C/32°F-104°F  Water Bladder Capacity: 450ML/15.2OZ, 1.5L/50.7OZ  Subcostal Circumference: 70-130cm/27.56-51.18in  Water Tube Length:104cm/40.94in  450ML Water Bladder Size:8.3x27.5cm/3.26x10.82in  1.5L Water Bladder Size:17.5x33cm/6.89x12.99in  Item Size:26x32.5x0.5cm/10.23x12.79x0.19in  Item Weight: 173g/0.38lbs  Package Size: 27*20*6cm/10.62*7.87*2.36in  Package Weight: 474g/1.04lbs *Package Lists*: 1x Running Hydration Vest  1x 1.5L Water Bladder  2x 450ML Water Bladders  1x Water Tube