A 99 euro vacuum food saver will get you a long way in sending drugs worldwide. Combine that with some clever packaging and the chances of it getting caught at customs are pretty small.
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.