These are clothing of different types all rolled up tightly to fit into your suitcase. They may be packed inside stretchy covers; I have several I use for items that I really don't want looking like I crawled out of the wrinkle factory. Takes a lot less room, too, so you can use a smaller suitcase or carry-on bag.
This a good tip I used when packing. Don't travel much anymore, as I hate flying now. It was nice then, people dressed well and full dinners were served. Oh well...I enjoy driving anyway, nice scenery to look at! ~.~