I have an Ikea mattress. As probably all their mattresses, it arrived rolled. Unfortunately, I didn't keep the plastic bag. I need to move soon, so rolling the mattress back sounds like a great idea for transportation. Apparently, this can be done, provided one has a large enough plastic bag. But I can't locate one in Hong Kong, or at least I don't know where to look for one. In the US apparently you can pick up one from U-Haul for a few bucks.
Here is how some people roll 'em
https://www.youtube.com/watch?v=Pb9VNI3qGVk