Ladies: forget about those cute petite-sized luggage bags for air travel. Yes, they may connect and function well and are lightweight, but don't forget about the above #limit of bags.
Even though your clothes are much smaller and weigh less than men's, those bags are just too small to carry enough to be practical for air or train travel where the key is to have the fewest bags possible.
They are great, however, for car travel since they pack easily in the trunk.