My wife does sewing pattern printing which I think is somewhat similar, ie very large format prints on a very expensive printer. She ships either folded in a large-size envelope or (for an extra fee) rolled in a sturdy container.
Looking at the picture on the website here, it looks like the bags are big enough to support rolling, so I imagine it doesn't crease the plans.
Looking at the picture on the website here, it looks like the bags are big enough to support rolling, so I imagine it doesn't crease the plans.