They sell travel space bags. You roll them to get the air out. No vacuum needed.
My wife and I used them on a seven day cruise. Most of our clothes fit into two carry on pieces of luggage. We had only one checked piece of luggage. We bought four medium size and one large at the Container Store. Happy cruising. :-)
Costa Atlantica, 3/23/03
Jewel, 2/1/10, RCI cancelled our cruise, (insert sound of sobbing)
Most of these bags have one-way valves so you just roll the air out. They really work quite well BUT....remember that as they are compressed and you can fit more in your luggage, they also WIEGH much more so do not go over the limit the airlines state or you will have to pay excess wieght fees.
I use a brand called Pack Mates. They have a one-way valve and I sit on them to get the air out.
However... be aware that with the bags totally compressed, your suitcase can hold lots more and it can end up VERY heavy.
Plus, the TSA people tend to want to open and look inside any "hard" plastic bags... then they don't know how to re-seal and re-compress them, which makes getting everything back in the suitcase difficult. That happened to me in the New Orleans airport... fortunately, at that time they were inspecting the luggage contents in front of passengers and allowed me to re-seal the bags.
I still use mine, but don't squeeze ALL the air out.
Ziplock bags work as well and are economical. Just pack the clothing item inside leaving a little room at the top; place the bag on a flat surface; roll up, compressing, from the bottom; then seal the bag and unroll. The air will have been all squeezed out and the bag will be flat and packable.
Land Cruise, Britain and Belgium
Now posting as MichelleP.