SpaceSaver actually makes a product for travelers. Instead of using a vacuum cleaner to suck out the air, you simply roll them up to squeeze out the air. Then you unroll them and they're compressed. (I don't know if this same technique would work with the regular bags.)
One thing to keep in mind with SpaceSaver bags, though, is weight. It's very easy to exceed the 50 lb limit with a suitcase normally. If you're compressing the stuff even further, you could wind up with a very expensive suitcase. The overweight fees airlines are charging now are awful.