US Patent 11771052 Portable pop-up pet pen

A portable pop-up pet pen compacts into four corner post members for travel or storage. Each corner post member contains a base rail, top rail, and mesh wall portion. To open the pet pen, the base rails are pulled out and down, and each is connected to the base of another of the corner post members. The upper rails and web walls are then pulled up from the base rails, and are attached to the other corner post members. A top frame may support a roof or fly. The compacted posts can fit into a bag or case for storage. Two sets of four corner posts can be used to build a double-size pet pen.