Excerpt from the Thaw Catalog: Large rectangular bags of soft skin were named "possible bags," as they were used for storing clothing and any other possible household items. Such bags are also referred to as "saddle bags" because in transport they were attached to each side of the saddle for good balance. This custom explains why these bags were made in identical pairs and decorated on only one side. (c.f. Wissler 1904, fig.77; Hail and Schwarz 1987, pp.51-52; Hail 1980, fig.254; Brown and Issac 1990, p.98)
Physical dimensions: 
depth 3.5 in ; height 13.25 in ; width 20.5 in
count 2