Gare Montparnasse Luggage storage: how big are they?

THIS QUESTION HAS BEEN ANSWERED, Thanks. I cannot find online info about the size of Paris' Montparnasse train station's luggage lockers. We're thinking of flying in on an early flight to CDG, get over to the Montparnasse station and store our luggage until an afternoon TVG trip to Tours, so that we can enjoy 4-6 springtime hours (luggage free) in Paris between the flight and the train ride. Have you used these before? Will they fit a standard size suitcase (the 30" rolling ones you check-in rather than the carryone-sized)?