Boyd’s Bible Dictionary:
(bag). A shepherd’s bag (1 Sam. 17:40). A wallet for carrying food and traveler’s conveniences (Matt. 10:10; Luke 10:4).
Concise Bible Dictionary:
A bag, or satchel, often made of the skin of a kid, stripped off whole, and tanned by a simple process. They were slung over the shoulder (1 Sam. 17:40; Luke 22:35-36).
Strong’s Dictionary of Hebrew Words:
Meaning:
from 3950; a travelling pouch (as if for gleanings)