I don't find using Space Bags wrinkles clothes worse than other ways of packing. They may look a little wrinkled when you first roll them up to force the air out. Just unroll them and sort of pull them back into shape.
JKMMAH, there are very large bags that use the vacuum hose connection, but those are for large items like bedspreads, pillows etc. Things you're not likely to pack for a cruise.
We bought ours from a TV ad that gave us several different sizes. The smaller ones would be great for packing a day's outfits for children.