kesa

1. (plastic, paper) bag; plastic bag
   Da li vam treba kesa? — Do you need a bag?
   Stavila sam hleb u kesu. — I put the bread in the bag.
2. (under the eyes) bags under the eyes
   Posle tri noći bez sna imam kese ispod očiju. — After three sleepless nights I have bags under my eyes.
3. dated (for money) pouch; purse
   Deda je čuvao novac u kožnoj kesi. — Grandpa kept his money in a leather pouch.
4. (in anatomy) sac; bladder
   Operisali su mu žučnu kesu. — They removed his gallbladder.

In Serbia this is the everyday word for a shopping bag; "vrećica" (a diminutive of vreća) is also Serbian, just less common.