Collapsible storage device

A collapsible container, comprising:

• a plurality of resilient wall panels, each wall panel connected to each adjacent wall panel at a hinged connection, wherein the wall panels are arranged so as to articulate at the hinged connections between a collapsed position and an expanded position, wherein in the expanded position the wall panels define a bottom wall, four side walls extending upwardly from a periphery of the bottom wall, and an opening opposite the bottom wall into an interior of the container, the first and third side walls spaced apart and facing each other and connected to each of the second and fourth side walls, and
• wherein each of the bottom wall, the first side wall, and the third side wall comprises two of the resilient wall panels connected by a diagonal hinge extending to diagonally opposite corners of the respective wall;
• and
• an anti-fold lock disposed on the exterior of the container proximate to the hinged connection between the first and second side walls, wherein the anti-fold lock articulates into a locked position across the diagonal hinge of the first side wall when the container is in the expanded position.