Answer:
Pirates put their booty in it.
What travels from house to house and is sometimes narrow and sometimes wide but always stays outside?
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
My teeth are sharp, my back is straight, to cut things up it is my fate.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.