We purchased space bags that don't use a vacuum cleaner to seal. Once you place your clothes in them and seal them, you begin at one end and roll the bag towards one end, forcing air out of a 'one way valve' . I packed some things about a week ago for practice, they seem to have re-inflated only very slightly.
The site was www.packmates.com
, I think. I * DO NOT * work for these people. I found out about the bags in a cruise-critic board.
Hope this helps!
May 29th Spirit, Southbound Alaska