take up space in your case, so roll them as tightly as you can rather than try and fold them. if you have an elastic band that will go round them to keep them rolled, then this is going to help keep them in place.
find that your staples move around during the travels? worried that your t-shirts will take up too much space? rather than folding them the normal way, you can instead fold them into small rectangles and stack them vertically against the side of your case. not only will they then take up less space, but they are less likely to move during transit (if you stack something 