You can have one quart-sized ziploc baggie per person. I would just pack it in the checked luggage. I don't use BE, so forgive my ignorance, but I thought it was a powder makeup and not a liquid? If it's a powder, then there's no need to put it into a baggie at all. You can just put it into your regular carryon.
girli565 - how can you watch them search your luggage? Whenever mine has been picked for inspection, the only way I know is because there's an inspection tag inside when I open it up. I thought they do the inspection after you check your bags? Also they have restrictions on what kind of lock you can use. It has to be TSA approved, so that they can open it. If you use any other kind of lock, they will cut it off. Locks do not keep them out, they just keep your zippers from accidentally unzipping.
If I had a product that was that important to me, I would put a small amount into another container for use during vacation. That way, on the off chance that it was taken or lost, I would only be out that small amount and not the whole thing.