This is a RIXEN KAUL backpack and RIXEN & KAUL extender. I used them for commuting for two years, so they have a corresponding amount of wear, scratches, dirt, and sun fading. The extender is an adapter that attaches to the seatpost. There's a keyhole on the red part, but there's no key. The red part is quite sun-faded. Includes one steel band for ~32mmφ. The images look better than they actually are. Please do not purchase if you are concerned about the wear and tear. Although there is some wear, both the backpack and the extender function without any problems. - Brand: RIXEN KAUL - Color: Black - Material: Nylon - Features: With mesh panel - Storage pockets: Outer pockets available - Includes a dedicated rain cover Thank you for looking.