This heavy - duty hiking vest is a great helper for cross - country hiking. In terms of fabric, it uses waterproof nylon Taslon, which has the characteristics of water pressure resistance, moisture permeability and water repellency, and can cope with complex weather. It is matched with polyester sandwich mesh cloth and polyester - ammonia cool mesh, which has excellent air permeability and keeps dry and comfortable during hiking. The functional design is very considerate. It has a built - in 2.5L water bag connected with a drinking tube, which is convenient for replenishing water at any time. It can also be reversed for self - storage, and a 2.5L water bag can still be accommodated after storage. The chest pockets can hold 2 soft water bottles. The left chest is equipped with a compass, a rescue whistle and a reflective tape ring, which helps with outdoor navigation and safety. The placket single - hand adjustment buckle can flexibly adjust the chest circumference. The back can store clothes and blankets. The hem rope hanging ring can fix trekking poles. A 2.5L water bag is fixed under the back collar. The back storage bag can be reversely worn for self - storage, meeting various storage and use needs and providing comprehensive support for hiking trips.