The tutorial is by Purl Soho. They provide great step-by-step instructions and photos to make this wonderful bag. (For a price)
I tweaked it just a little, changing the measurements to allow for a 2-toned bag, and combining bits of each of their 3 methods to make a lined, boxed bottom bag.
I hope you enjoy the tutorial! Make yourself and everyone you know one of these to replace their boring plastic grocery bags.
Dimensions to create exterior panel:
- 1 bottom fabric (canvas) : 18" x 24.5"
- 2 top fabrics : 18" x 6.25"
- Lining fabric: 18" x 32"