Being the cheat bastard that I am, I always reuse my (envelop) bag. Sealent tape on one end, reuseable snap lock on the other. Before I seal the bag, I drape a piece of the cheapy, 1mil plastic from Home Depot over bleeder and nothing sticks to the bag. Usually get 6-8 pieces from one bag.

Mark T.

I do that too.  I'm slightly more pikey though as I use gum tape on both ends and pull one end open and then use the same tape to seal it back up for the next moulding.  Works fine!  I dont even put plastic over the breather, I just shake the shards of cured resin out of the bag.