I guess I didn't see that, all I saw were A123 packs with options for style cell count balance connectors and such. And A123 does make a flat pack it's just the 1100mah cells in a hard case (2S2P).
Jeff
This one?
http://www.maxamps.com/categories.php?cat=223
That is the same size (dims) as my 2S2P M1 cells.