Latitude offers a small bag called the "Slim Jim"...I actually have one that I use when I don't want to carry the bulky Pro Bag. Mine holds about 10 discs and is priced around $20. If you are going with Lat64 for discs, this would give you a good option for small bags. Also, get at least 1 Lat64 Pro Bag and fill it up with discs and sit it in the store. When people see how big that bag is, their mouths will drop.
http://www.marshallstreetdiscgolf.com/product/ST-21525/Latitude-64-Slim-Jim-Bag/
http://www.marshallstreetdiscgolf.com/product/ST-21525/Latitude-64-Slim-Jim-Bag/