A bursa (or burse), from Greek βύρσα ("hide", "skin", "bag"), is a parament about twelve inches square[1] in which the folded corporal is kept in for reasons of reverence.
Until the reform of the Second Vatican Council, when it fell out of use in many places, the bursa was carried by the priest to the altar when he entered for Holy Mass.
It is placed upon the chalice at the beginning and end of the Mass and on the altar at benediction.
Usually, the bursa was made from two pieces of cardboard which were bound together at three edges; the forth was open to receive the corporal.
The outer side of the bursa has the same liturgical color[3] of the day and occasionally the same ornamentation as the vestments.