Pet runner. (Kempshott RG22)
Run garden frame for rabbit, guinea pigs etc. It's solid, but does need a clean, as it's been stood on end in the garden for some time. Half of the lid is hinged and lifts up. One end is open as it's supposed to be pushed up against something like a fence, wall or shed. It is big, s a down in picture against bins, so anyone wanting it would need a van to pick it up.