This has helped me organize my tote bag and I am so pleased with it! For most tote bags, I think the large would work best. It fits into my bag great, without much wiggle room. No complaints really -- Sometimes when I toss something in, it gets caught up on the little handles at the top of the organizer. I'm thinking of just snipping them off, since I don't use them to take it in/out as intended (it's pretty much only going to stay in this tote). Otherwise, I'm extremely happy with it and especially for the price.