I wanted the side opening style too. I found that Mutazu made two side opening models.

http://www.mutazu.com/products.php?cat_id=7&menu=Hard%20Saddlebags&s=prod.php

The LN was a bit small for me. The MU was about the same size as the Tsukayu. They are not fiberglass so not as nicely built as the Tsukayu, but they are a lot less expensive and I loved retro look.

'06 Speedy, "Born to raise entropy"