Polyvinyl Chloride Imported Heavy Duty Material: Made of 500D PVC Material, Piscifun dry bag offers durability and protection for your items during outdoor activities Sealed and IPX8 Waterproof Phone Case: The backpack comes with a fully welded seal which helps in a stronger, durable waterproof construction. It also comes with a waterproof phone case, which is suitable for phones up to a diagonal screen size of 6.5 inches. They also have a touch friendly design as it helps you to operate your phone during water activities User Friendly Design: Each of those super user friendly dry bags have adjustable shoulder straps. They also have an outer mesh pocket which helps you to hold things which gives you space for non-dry storage Convenient Shoulder Strap: These dry bags have adjustable double shouldered straps which provide safety and stability while wearing the bag. These sturdy straps help the bags in not slipping off the shoulders during the water activities