Speedy as a Pilates bag?!

Call me crazy but I have a huge desire to buy an old Speedy 30 or 35 and use it as a Pilates bag. I would keep in it two hand towels, a pouch to keep grippy socks, a small handheld fan and the Longchamp pouch. Any advice on which size would be best?! Am I out of my mind? 😂