When rolling up clothes, you push some air out before you try closing your suitcase. Also, I think packing the various parts into a container _feels_ a bit eas

When rolling up clothes, you push some air out before you try closing your suitcase. Also, I think packing the various parts into a container _feels_ a bit easier with rolled-up clothes than with folded ones (relatively flat, with slightly varying dimensions), at least partly because you’re a bit more inclined to compress them into a space. The bin packing problem for rolled up clothes also may be easier than that for folded clothes, mathematically, but I can’t think of an argument as to why it would be.