black bag

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A bag in which physicians traditionally carry instruments and a stock of drugs, as on a house call.
• noun A physician's stock of drugs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Alternative spelling of black-bag.
• noun UK A black plastic sack produced for the disposal of household waste.
• noun The pouch or case traditionally carried by medical doctors, especially when making house calls, and containing medical instruments and supplies.
• noun A pouch or case containing burglary tools.