I had the perfect bag, once upon a time. It was the perfect size to fit my sketchbooks, pencils, a water bottle, and a few books to keep the kiddos entertained. Then it wore out. A new art satchel was needed, this time with a little more flair. I kept the dimensions the same but added some stripes--because really, everything is better with stripes.
The Long and Short of It:
10" x 3½" x 12"
(18) 2½” x width of fabric strips
1 1/3 yards heavy fuseable interfacing
½ yard lining fabric
16” x 35” batting
Cover fabric: Origin by Basic Grey for Moda