Abstract: A latching mechanism for an expandable CD book which expands with the insertion of CD disks includes a spring-loaded strap which is anchored at one end through a stretchable elastic web to one cover of the CD book and which is anchored to the other cover of the CD book through a snap arrangement. When the CD book is filled, the top and bottom covers of the CD book are more separated, which increased distance is accommodated through the extension of one end of the strap made possible by stretchable elastic webbing. When the strap is looped around the expanded book and is attached by the snap, the increased thickness of the book is taken into account by the extension of the strap, with the strap being secured tightly in place around the expanded book by virtue of the stretchable webbing which is anchored at one end to one cover of the book.