'Bag' in the Bible

Then he took his staff in his hand, picked out for himself five smooth stones from the wadi, and he put them in his shepherd's bag, in the pouch. And with his sling in his hand, he approached the Philistine.

Then David put his hand into the bag and took a stone from it and slung [it]. He struck the Philistine on his forehead, and the stone sank into his forehead, and he fell on his face to the ground.