DRY TANK D2 40L is a backpack that can be used for 2 to 3 nights of travel or for touring and diving expeditions. The DRY TANK D2 Series is a basic backpack for 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. Even if you store wet items, the water accumulated inside can be discharged from the drain plug. Not only is it functional, but the red cap makes a great impression. With a wide variety of sizes and color variations, it is suitable for a variety of occasions, from professional outdoor activities to daily use. 4 types of inner pockets that can be attached and detached with Velcro tape for storage of small items. We also have a drink holder and mobile holder that can be attached to all the dry tanks shoulder belts. 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. The flap part is made with Velcro so you can securely close the opening. In addition, it will sound when opening and closing, so it may be easy to notice when it comes to pickpockets. Tarpaulin fabric is hard when temperature drops, so we use a nylon fabric that does not harden even at low temperatures on the flaps where flexibility is required at all times.