i love those. i have used them on my last three cruises and they save me a junk ton of room. i currently have the kind that you have to roll out the air, but i am going to buy the kind that you vacuum out the air for my next one (IN 16 DAYS YAY!!!!!) because sometimes i can't get all the air out.
i swear by them. i've never had much of a problem with my clothes being wrinkled...even my dresses travel well in them. they are as good as the commercial says the are
surprising, i know...
you can buy them at Wal*Mart