Polyester waterproof material , the packable hiking daypack is breathable and durable that largely resists abrasion , tearing and scratching.This foldable backpack weighing only 0.65 pounds, It's incredibly lightweight.Folded down to the size of your hand, it even fits in your pocket, making it easy to carry.The large capacity of 18l meets your basic needs.There is a kettle in front of the backpack, which can easily take the kettle to drink water. Backpack with high quality zipper, in the fine can also block the infiltration of rain.