Mass Stupidity Part 2

Susan is going on holiday, but wants to keep her luggage as light as possible. Don't worry she's had an idea:

"How can I fold my clothes to make them weigh less?"

Unfortunately the answer is in two stages, the first of which is "re-write the laws of physics", so it could be difficult.

This is a return to a similar situation here- http://stupidcolleague.blogspot.com/2006/05/mass-stupidity.html