Another option is to use a Swift Paloma. It's a smaller handlebar bag. I have one and swap it between bikes. I just bought extra Klickfix mounts and they work great. Plus you use a should strap and carry it with you. Super handy for day trips. https://builtbyswift.com/shop/horizonline-paloma/

We also use Acorns here. I have an Acorn Roll and my wife uses a Boxy Rando on her MAP. She likes that one just fine, but it's pretty big. Often, it's more space than she needs.

I use a Swift Sugarloaf with a Wald 137 on my Bilenky. Now that's a super nice bag for $150 and so versatile. I also have a Swift Ozette that's just as nice as the Acorn Boxy Rando. Does not have the classic look of the Acorn bag, but that's not a concern to me. They all get covered in dirt and grime if you actually use them.......