From Sarah Kirsten:
The Big Bluestem Backpack is an unlined waxed canvas pattern. Designed to be a simple backpack for quick cutting and sewing. The waxed canvas gets lovely wrinkle lines with use.
Recommended Fabric: 10 oz waxed cotton canvas.
Finished Measurements: 12.5" wide x 17" high x 4.5" deep / 32 x 43 x 11 cm
Sewing level: Beginner / Advanced Beginner