So these movies are primarily for sploshers: I just added the bag bits as a bonus for all my plastic-encased friends.
Because of that, the bagging segments are only about a minute or two long, depending on which of the four scenes we're talking about, and they start with the performer already trapped inside.
I actually have to remove these scenes for the UMD store; they are afraid this is too close to breathplay, which they have banned. I don't do breathplay either - my performers are guaranteed an air supply - but you can't fight the censors. So the scenes only appear on the Clips4Sale version.