Bark Containers A variety of barks were fashioned into containers, usually by folding or cutting patterns and then stitching the seams together. Finished birch bark containers with stone and bone working tools. Pattern for a birch bark MOCUCK - a stitched-pattern container. Pattern, cut out. Completed mocuck, stitched with pine root and water-proofed with pine pitch. Cootonwood-bark mocuck. Folded elm-bark tray, with reinforcing rim stitched to the upper edge. Seamless, folded birch bark container. Waterproof without pitch! Folded bark dishes with a few gourd containers.