I learned a neat trick while googling how to pack light. I apologize, I lost the website link for the site, but it was awesome! you get two pillowcases (which you may like to use while travelling anyways) and you lay your tops on one and bottoms on the other. Fold the pillowcase (with your clothes on it) in half and then roll tightly, this saves lots of room and a super cool idea!!!
I just found the site again, here it is!