Players with more than one card slot?

Many player makers are so obsessed with having thin anorexic players that skimp on battery life just to be a bit thinner. They may also be thinking about skimping on card slots just to be a bit thinner. Imo function is so much more important than form. It is worth having a bit more thickness to have much greater battery life and more than one card slot, as long as the player will still fit in a standard shirt pocket.