Presentation 
Set (3 min)
 This lesson follows Area, Symmetry and Parfleche Bags
 Explain to the students that some parfleche containers have the shape of a
rectangular prism and show them the photographs below.
Development
 Ask students to make a list of common attributes of these prisms, for example the shape of the faces, the number of faces, the fact that they come in pairs, as well as the number of edges and vertices.
 Hand out the nets for the rectangular prism and have each student cut out the net and construct a rectangular prism. Have each student expand their net somewhat, draw it on the legal sized sheet of paper and cut it out to form another rectangular prism. Have each student trace this new net onto the simulated rawhide, cut it out, and fold to form a simulated parfleche container. Use the holepunch to punch holes in the parfleche container at the point indicated in the net.
 As in the lesson Area, Symmetry and Parfleche Bags, have the students use the coloured grid paper to create a symmetrical design on their parfleche bags. Fold up the bag in the shape of a rectangular prism and use the yarn to tie it closed in a fashion similar to the photographs above.
