FESTIVALS CHOICE :BRIGHT COLOR LIGHTWEIGHT DURABLE WATERPROOF ,hydration backpack specifically designed for those who want to stand out from the next festival, rave,carnival, edm or edc KEEP COLDING: KUYOU Hydration pack have thick insulated layer ,the insulated bladder compartment keeps your liquid cool or hot for up to 4 hours.alone bladder pocket that is to improve the insulation effect and achieve the separation of dry and wet. PROFESSIONAL 2L HYDRATION BLADDER: Hydration bladder included. Soft mouthpiece with easily accessible ON/OFF valve.pull the rubber mouth piece out and Simply bite the mouthpiece to suck water,Push rubber mouth piece back to close ! Our water bladders passed pneumatic pressure test, 24 hour swing test and 24 hour vibration test. It is completely pressure-tolerant and leak proof for carefree biking, running, hiking and other outdoor adventures! COMFORTABLE RELIABLE: Ergonomically fits for your shoulders, chest, and waist,3 straps are all adjustable for reducing bounce,You'll never lose our balance because of the water load,Soft air mesh back speeds up air-flow and makes your back cool. Foam padded shoulder straps are extremely comfortable. VERSATILITY : The hydration pack is your perfect choice for Festivals, Raves, Hiking, Biking, Climbing, Running and More. A decent Holiday Gift for families and friends who love outdoor sports