a top panel, a bottom panel, a front panel, a back panel and a side panel, wherein each panel is rectangular in shape and comprises inside and outside surfaces and four edges around its periphery, and wherein the panels are permanently joined to each other, correspondingly edge to edge, to create a five-sided box that has an open side thereof, thereby providing access to an internal volume within the box;

a closure flap characterized by inside and outside surfaces and first and second ends, wherein the outside surface at the first end of the closure flap is permanently secured to the inside surface of the bottom panel at a location within the box, and wherein the closure flap extends through the open side of the box; and

securing means for separably securing the inside surface proximate to the second end of the closure flap to the outside surface of the top panel;

wherein at least one of said panels comprises a semi-rigid material, and additionally comprises abrasion-resistant fabric attached to substantially all of both inside and outside surfaces thereof; and

wherein the internal volume comprises such size and shape to accommodate the portable computer therein.