This is the most useful carry-on suitcase I've seen in a while.
Skyroll has a few different options for convenient carry-on garment bags, but their
Skyroll on Wheels product gets my vote. It works like a standard carry-on suitcase, except large clothes are placed in a separate garment bag and wrapped around the outside of the suitcase. The suitcase and garment bag are designed to be used together, but can also be used as separate pieces of luggage.
The suitcase has two sections, a main compartment for most of your clothing, and a top compartment for quick access to items you may need while traveling. Open the large front door to load items into the main section of the suitcase. If you need more room in the main section, the top compartment is adjustable, just move it up to make more room in the main compartment. The top compartment is for items you may need to access while traveling. Once SkyRoll is packed, you don't need to remove the garment bag to get to the top compartment, just unzip the top door.
Three suits can be loaded into the garment bag. The garment bag measures 21.5 x 48 inches. The suitcase measures 22 x 12 x 7 inches. With a typically loaded garment bag wrapped around the suitcase the final dimensions are 22 x 14 x 9. It weighs nine pounds empty, seven pounds if you don't use the garment bag.