Brie round come in many sizes, but the guidelines for buying them are all the same. Look for brie rounds that are about one-inch thick, with a bright, white, powdery rind, and a sweet odor. They should give slightly when pressed, and the rind should feel "full." Avoid cheeses with brown or gummy rinds, or ones that sunken or dried out. Avoid brie cheeses that have a harsh, acrid, or pungent smell.