This backpack is designed for 2-3 night travel or for touring and diving expeditions. The DRY TANK D2 series is a basic model of the Stream Trail that boasts outstanding waterproof performance. The surface material used in waterproof bags is made of polyester fibers that are welded together with synthetic resin film. It is also used in banners such as tents and outdoor advertising banners often found in towns, and construction sites. It is resistant to water and tear and resistant to abrasion. The opening is easy to fill with water, and the waterproof flap is rolled down to provide outstanding waterproof performance and a soft fabric that is easy to roll. It can be easily wiped off with some dirt, making it easy to care for, so you can use it on the field or on the town. Store wet items and water accumulated inside can be discharged from the drain plug. This backpack is made with 2 colors of earth colors that are familiar with nature. Enough capacity and durability to support a variety of scenes such as fishing and camping, traveling and business trips. The DRY TANK series is perfect for a variety of occasions, from professional outdoor activities to daily use. There are 4 types of inner pockets that can be attached and detached with Velcro tape for storage of small items. Also available in all DRY TANK series drink holders and mobile holders for external use. Inner holder sold separately. The opening has a roll-down flap and a waterproof flap on the opening to prevent water from entering. Roll down for a high level of waterproofing It is effective when it comes to rain. In addition, the contents will not pop out when the bag is knocked over. Tarpaulin fabric is hardened when temperature drops, so we use a nylon fabric that won't harden even at low temperatures on the flaps where flexibility is required at all times.