With respect to cases for laptop computers, and the like and, an improvement comprises pair of opposing strap guides through which elastic side retention straps are respectively journaled to prevent the straps from interfering with the closure of the case. A case according to the invention comprises top and bottom covers hinged in the rear of the case, and a closure mechanism such as a zipper is for closing the top and bottom covers. Right and left elastic retaining straps respectively connect the top and bottom portions of the case, and the right and left elastic retaining straps pass through respective strap guides, each attached to the inner surface of the top portion of the case, to prevent the retaining straps from being caught in the hinged portions of the computer or the closure mechanism as the case is closed. Each elastic retaining strap may twist between the bottom cover of the case and each strap guide.