I save the gift bags and reusable containers. This year, all the recycled gift bags I had are being given a second life. So they won't match, who's gonna care?
But it sounds like your MM is pretty reasonable and simple. No confetti or stuff.
That's exactly what I'm doing. I have plastic bags to hold actual food items, but I'm reusing all the old gift bags from previous years (both leftovers from giving and plenty that I've received).