I think you ought to have a sack race between Mikes cartoon Mike, and your flour sack hehe...
that would kick ass! the sack could play dirty and trip cartoon mike and then cartoon mike could grab a loose thread and unravel the bag of flour as he runs away and then you could have a classic cartoon moment when the flour hangs in the air with no bag around it and then falls to the floor in a big puff or.... em... flour 
sorry getting carried away again!! 
Alan
Technical Director - Framestore
Currently working on: Your Highness
IMDB