A device to protect a padlock with a lock body and a shackle has a plurality of walls forming an open ended, hollow structure. In one wall there is a slot to receive a hasp of a staple and hasp locking mechanism. In another wall there is a hole to be useful with a plug-type locking mechanism. Traversing two of the remaining wall is a continuous slot for use with a variety of other locking mechanisms. The hollow structure is square in cross-sectional dimension and is sufficiently large to admit a padlock through one of its open ends and long enough to allow a padlock to completely enter therein through one of the open ends.