Lovelihood

Turn the bag right side out again, so that the encased seam lays on the inside of the bag. Push corners out.

Fold in half, wrong sides together (if your fabric has a wrong side) to get a squarish shape. Stitch the two sides, starting at raw edge and moving toward the fold, about a 1/4" from the edge.

Cut a lot of them. I did mine in a variety of sizes, but the vast majority were made from 25” x 13” swatches of muslin. I also did a few that were a bit longer, to accommodate unwieldy things like lettuces and chards. Just remember to cut pieces about twice as long as your intended bag length.