Excerpt from the Thaw Catalog: Thunderbird images are predominant in the decoration of skin bags, either in recognizable or abstracted form. The birds are invariably pictured above an abstract rendition of trees or plants on the surface of the earth. Below are Underworld reptiles, often reduced to diagonal lines on the tabs of these black bags. The reverse side of this particular example shows turtles below a ground line with plant symbols. Sotheby's 1991, lot 88; Van Norman Turano, February 1992, p.46-B; Vincent 1995a, p.15; Vincent 1995b, p.68, pl.XII.
Physical dimensions: 
length 20.5 in ; width 6.5 in
length 21 in ; width 6.5 in ; depth .25 in