The problem with sewing a reversible bag, I think, is that one can never decide which side one prefers.
Well, I can't, anyway. (And, no---this is not the bag I made and wrote about yesterday afternoon. This is the one I had to make myself last night after I'd mailed that one off to its new owner.) Clearly, I could never craft for a living. I'd have to make two of everything---one to sell, one to keep! Anyway, the first bag was reversible as well, and fully lined with canvas. Mine has about 4 inches of the red fabric at the top of the canvas, as I was (duh) running out of said canvas. (Home Depot, here I come!)
Please don't ask what got neglected in order to allow me my little sewing-bee. And for heaven's sake, don't look in the kitchen!