Folding tonneau cover

A tonneau system for a vehicle, comprising:

• rectangular panels, each panel comprising a long edge, a short edge, and a guide, wherein
• the guides are staggered on the short edges of the rectangular panels and are movable between a planar configuration and a stacked configuration, wherein
• in the planar configuration, the rectangular panels are positioned in a single plane and overlap an area corresponding to an open cargo volume of the vehicle, and wherein
• in the stacked configuration, the rectangular panels are stacked together in parallel planes;
• tracks, wherein
• the guides travel in the tracks when the rectangular panels move between the planar configuration and the stacked configuration.

A vehicle comprising:

• a cargo volume bounded by a bed and side walls;
• tracks mounted to the side walls and above the bed;
• and
• rectangular panels rotatably coupled to each other and collectively coupled to the tracks so that the panels can move between a planar configuration and a stacked configuration, wherein
• in the stacked configuration, the rectangular panels are positioned above the track opposite from the bed.