
1) Eared flask 2) Leather flask
Found on
https://www.crosswordclues.com/clue/costrel

• (n.) A bottle of leather, earthenware, or wood, having ears by which it was suspended at the side.
Found on
http://thinkexist.com/dictionary/meaning/costrel/

See pilgrim bottle.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Cos'trel noun [ CF. W.
costrel , Old French
costrel , Late Latin
costrellum , a liquid measure,
costrellus a wine cup.] A bottle of leather, earthenware, or wood, having ears by which it was suspended at the side. [ Archaic] « A youth, that, following with a
costre...Found on
http://www.encyclo.co.uk/webster/C/168

a flask made of leather, earthenware, or wood, usually with an ear or ears by which to suspend it, as from the waist.
Found on
https://www.infoplease.com/dictionary/costrel
No exact match found.