An old, used native american basket, pitched to hold water. Baskets like this were made by several groups including the Navajo, Paiute, Havasupai and Apache. The weave of this one, especially the fine twining around the lip, make me think this is probably Paiute. It does not currently have handles but, it is small enough to be comfortably carried.
It measures 7″ x 5 3/4″ and is in very good antique condition.