Hydration Pack Backpack with 3L Water Bladder for Men & Women, Hiking Daypack with Thermal Insulation | Running, Cycling, Camping, Skiing, Outdoor Activitiesnylon Imported THERMAL INSULATION TO KEEP LIQUIDS COOL REINOS water backpack for hiking is definitely the best outdoor companion, it features an insulation layer made from high quality aluminum foil that keeps liquid cool for hours, you can use it as a daypack but it can also be used as a portable cooler for outdoor activities. 3L WATER BLADDER TO BEAT THE HEAT The dark days of harmful plastic are behind us, REINOS 3L bladder is completely safe for