Description : Hydration Pack,Hydration Backpack with 2L Hydration Bladder Lightweight Insulation Water Pack for Running Hiking Riding Camping Cycling Climbing Fits Men & Women Hydration packs are designed specifically for road cycling /running/ Hiking 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 Designed with body mapping technology for efficient ventilation and lightweight comfort.Shoulders, chest, and waist,3 straps are all adjustable for reducing bounce The mouthpiece has been upgraded to an easy ON/OFF push valve designed and 135 degrees rotatable mouthpiece to help stop leakagea and easy drinking |