Matches the carry-on, easily slips
"Matches the carry-on, easily slips over the carry-on’s extended handle, then can fit under the seat in front of you, laying on its side—magically maximizing of what you can take on a trip, look good, and only do speedy, never-lost-by-the-airline carry-on! Then the nice features like the shoe compartment on the bottom, the padded laptop section and a zippered pocket inside. Also works by itself for a night or two away when you don’t need to bring much."