I finally got a chance to slip up to the sewing room and dig around for some yarn that might stretch the Outback Wool I'm using for my Constant Companion. It's not the exact color I would have chosen if I'd been standing at the yarn shop with an unlimited selection, but it will felt and it blends with the colors of the bag. The more I knit, the less obvious these stripes are.
If it's hard to tell where the substitute yarn begins and ends, it works.... right? I might be fussier if I had a better history of actually using my felted bags.
Now I've got to teach myself to do an Icord bind-off and figure out how my scaled down stitch count will work with the buttonholes for the strap. I can do this!