Sounds like you're looking for saddlebags rather than a topcase? The Givi E21 are good looking small side cases that are reasonably priced. They are top loading so all your stuff won't fall out when you open them, unlike some clamshell-type side cases. They are quite small though, so depending on how much stuff you want to lug around they may not work for you.
You might want to look at SW-MOTECH for mounting options. They offer mounting adapter plates for Givi, Kappa, Hepco & Becker, Krauser and Shad bags.
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