Olla-shaped storage baskets were relatively rare before 1920. Between 1920 and 1940 this form became popular with White buyers. Older baskets for storing grain were made of bundles of wheat straw sewn together with strips of mesquite or willow bark. Their shape was more globular than the olla, and they ranged in size from 100-400 gallons. They were so large that the basket-maker found it easier to work on them from the inside (photo). Field photo: Putnam and Valentine, c. 1900, in A. H. Whiteford, Southwestern Indian Baskets; Their History and Their Makers, 1988