I just completed a tote that was 4" x 15.5" on the bottom. Canvas plastic that I have was not long enough. Pattern called for plexiglass. Went to Home Depot & Lowe's. Neither would cut the plexiglass for me and I don't know how. Finally found a 1/4" thick wood they call craft wood in the lumber section. It was about 20" long. Width was fine. I drew a line and hubby cut it. He sanded it and rounded the corners and sanded them. I made a fabric sleeve out of the lining and used velcro to close it so it can be removed for washing. I plan to get scotchgard to use all over the tote prior to using it. It will repel dirt and be easier to clean.