Costrel

[Sarah]

A bottle of leather, earthenware, or wood, having ears by whichit was suspended at the side. [Archaic]A youth, that, following with a costrel, bore The means of goodlywelcome, flesh and wine. Tennyson.

[Dave Paprocki]

A small vessel for storing or carrying wine, ale, water, etc.; specifically a flask or bottle with an ear or ears for the insertion of cords by which it may be carried (also called pilgrim