Burse

From the Greek byrsa, meaning, "a bag." A burse is one of the furnishings of the altar for communion, and is a pocket case made from two squares of some rigid material covered in cloth. The burse sits on top of the chalice, paten and veil, and serves to hold a corporal. Often, the burse also serves to hide an extra purificator. It also may refer to the small leather purse/wallet-like receptacle containing the pyx for taking the Sacrament to the sick and shut-ins.