We use best quality gallon size zip lock bags, put the meat in, and sous vide away.
I know a guy that did a bunch of ribs that way a few years ago, after grilling and lots of BBQ sauce He brought them to a big family gathering. His nephew later told Him "Those were the best tasting ribs ever Uncle Tony, but I have never seen baby back rib bones that small in my life".
Tony smiled and said "Thanks, but those were not baby back - those were six racks of coon ribs".