Abstract: An attachment system for pickup bed covers as well as a tonneau cover construction and a collapsible canopy for pickup beds are disclosed. The attachment system includes attachment rails which are affixed to a top of the sidewalls of the pickup bed. The attachment rails have a depending lip which defines a narrow bight that extends along one edge of the rail. A narrow thin resilient fastener strip sewn along an edge of the pickup bed covers is folded inwardly and inserted in the bight to secure the covers to the rail. The front edge of each cover is attached to the pickup bed with a hook and loop fastener, and the rear edge is attached to the tailgate with a rubberized magnetic strip. The tonneau cover incorporates the attachment system. The collapsible canopy is supported by a foldable framework that includes first and second X-shaped frames having two U-shaped ribs pivotably connected by a scissor-type joint.