Hi,I love both size compagnon's and use both. I had a money wallet and wasn't crazy about having to find the magnetic button to snap it shut all the time. I like zip wallets because my stuff is safe inside if I carry just my wallet. The small compagnon amazingly holds as much as the large but I really like how the large sits in my Day bags along side my Bal MU bag and all my cards are lined up. I don't care about keeping my checkbook in my wallet because I don't use it as much so I put it in my MU bag. The small compagnon works for smaller Bal bags really well and will also fit in the large inside pocket of the Day bag.