The straight frame Jerrycan® moel is a small rear mount specific bag to max out your carrying space. It's narrow, only 2" wide, so your legs don't hit it when pedaling. Good for carrying some spares, tools, or some food. Constructed with VX 21 fabric, padded ballistics nylon along the tube sections, yellow interior, Plastic HD side panel inserts, #5 YKK water resistant zipper, and an interior elastic which keeps things from rattling.