Roll-top type backpack made of waterproof material and sewing-free manufacturing method Capacity approx. 24L A BAG made of PVC tarpaulin, which is used for tents for stores, etc., by welder processing without seams in the main body.　Even if it rains suddenly, the luggage inside will not get wet, so it is the best match not only for work sites, but also for marine sports such as fishing, outdoor scenes such as camping and barbecues, and commuting by bicycle or motorcycle.　In addition, even if you put wet things inside, it will not seep out, so it is easy to use in pools and sea baths.