Abstract: A bottom loading wafer carrier box provides a cavity which appropriately may have a still and particulate free environment for a wafer carrier handling silicon wafers during their storage,transport, and transfer into and out of processing equipment for the manufacture of semiconductors. The box includes a housing enclosing the cavity with an open bottom suitable for receiving the wafer carrier into the cavity. A releaseable door is provided for sealing the open bottom from the ambient environment about the housing of the box. A cam bar is slideably connected to the outside of the housing and operably connected to a moveable slider extending within the cavity. The slider has a carrier catch adapted for retaining the wafer carrier within the cavity and a cushion to retain the wafers within the carrier and to reduce the effects of shock upon the wafers.