A round basket or bowl is best, although you might have a small oval shape that works. Fill with rolls, toast, cookies, whatever, then fold the 4 flaps over. It is best not to butter anything first.
Grease is one of the hardest things to get out.
Some have figured out a way to make a collar out of one. Occassionally we find the pocket type that holds individual rolls. Look out for these. They don't hold the warmth in as well, but they look great. Orders won't be charged until we confirm the shipping with you.