The material is unknown, but it feels like nylon. There are about 5 pockets in total. The strap is adjustable (can be made longer). It hasn't been used much, so I think you can still use it for a long time. [Size] See the image with the measuring tape. [Notes] Some of the paint on the inside zipper is rubbed off. Slightly misshapen. The inside and outside pockets are the size of a feature phone. #HeartBag R tender KO