Dealers use moisture barrier bags that are heat sealed now as apparently dogs can detect vacuum sealed bags though unclear if it's outside contamination, like somebody putting together a package in a room full of weed shavings or smoke.
Both heat sealed and vacuum sealed are air-tight, so that difference should be a non-issue. Its the stuff sticking to the outside of the bag that might be an issue. For meat I'd imagine bleach should do the trick...no idea what you'd need to remove drug traces though. Not a skillset I plan on deploying anytime soon so didn't research it.
