Differences are only about dimensions and weight.
The dimensions of Poulette: 230 x 330 x 165 mm Weight of the prototype : 1,1 kg Designed to carry a 9,7'' tablet.
The dimensions of Cocotte: 340 x 380 x 180 mm. Designed to carry a 13'' laptop. Weight of the prototype : 1,5 kg
Both bags will have side bellow pockets, Cocotte side pockets will be similar to Poulette pockets.