We designed it for use in two scenarios:
1. Hang the trash bag roll on the bottom of bin, pull and set a bag on the top. When one bag is full, recycle it and pull up the new one. This trash bin is simple and easy to use, avoiding the trouble to find trash bags.
2. Its "U" shape design is fitting wall for any kind of plastic carry bag. It is not only designed for trash bag roll, but also encourages people to use plastic carry bag. Elegant styling design embedded good solution. There are two small brackets on the bottom side for holding and rolling the new trash bag when user needs to replace a full one.