These Gusseted Poly Mattress Bags offer fantastic clarity while providing superior protection against the elements, dirt, dust, moisture, and debris, or for moving or storage. These Extra large Plastic Bags are available, depending on your Mattress or Box Spring size, in 1.5 mil or 3 mil thicknesses. These large Bags can be used to cover hospital Bed frames and are made with vent holes for ease of use.