An apparatus comprises an upper portion and a lower portion. The upper portion defines an upper edge region, while the lower portion defines a lower edge region. An upper adhesive band is disposed on the upper portion and runs alongside substantially the entire upper edge region. An upper release liner, in turn, is disposed on at least a portion of the upper adhesive band. At the same time, a lower adhesive band is disposed on the lower portion and runs alongside substantially the entire lower edge region. A lower release liner is disposed on at least a portion of the lower adhesive band. The lower portion is joined to the upper portion so as to define a hollow enclosure therebetween with the upper edge region and the lower edge region forming an open end in the hollow enclosure. The upper adhesive band and the lower adhesive band are disposed inside the hollow enclosure.
