'Bag' in the Bible

He took his staff in his hand, and chose for himself five smooth stones out of the brook, and put them in the shepherd's bag which he had, even in his wallet. His sling was in his hand; and he drew near to the Philistine.

David put his hand in his bag, took a stone, and slung it, and struck the Philistine in his forehead; and the stone sank into his forehead, and he fell on his face to the earth.