HighlightsDesigned with polyester mesh fabric our running backpack provides excellent air circulationCome with different sizes water bladders retain liquids without any leakageEquipped with multiple storage pockets store your outdoor necessities like keys wallet sunscreenWe design unique reflective trim to attract driver s attentionThis lightweight running backpack has adjustable straps in waist and chestSpecificationCapacity:5LGender:UnisexDetailsFeatures:Comfortable Wearing Hydration Vest:Designed with polyester mesh fabricour running backpack provides excellent air circulation and breathability to keep your back cool and comfortable. Soft shoulder straps prevent your skin from abrasionand .38lbs lightweight effectively reduces your running burden. Water Bladder Capacity Combination:Come with different sizes water bladdersretain liquids without any leakage. 1.5L large water bladder support your long time runningyou can freely choose which water bladder you desire on your runningand 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 pocketsstore your outdoor necessitieslike keyswalletsunscreenphonetowelor any other items. You can quickly get what you need from front pocketor you can place your phone securely in the rear pocket with smooth zipper. Considerate Reflective Trim:Consider your safety at nightwe design unique reflective trim to attract driver s attentionand 1 whistle for you to warn in some dangerous conditions. Ensure your safetymake you to run faster and farther. Fit For More People:This lightweight running backpack has adjustable straps in waist and chestwhich can be personal modified to fit for different figure. Keep you away from terrifying bounce and shake. Ideal assistant for diverse outdoor activitieslike