FWIW, my roller bag was too thick to fit in the slide out storage bin in the new La Premiere cabin. The slide out bins are fairly narrow. They're long, but not very wide.

My LP ambassador was mortified and then someone else from the crew took my roller bag and put in the crew storage closet : ) Was a standard Tumi black rollerbag and I didn't think it was particularly over-stuffed or anything.

My LP ambassador said that the width issue is pretty frequent for roller bags, and while she loves the height of the cabin without overhead bins, the slide out drawers have caused some issues.

Might want to consider the roller bag thickness prior to the flight as well.

Have a safe trip.