So I put it to my preferred vendor of choice re would they consider using the 3M bags and they ignored my question. No great surprise as they are still confident in the single food grade vac seal that they use. It would be great if some of the vendors who have taken the time to post on this thread generate some discussion in the vendor forum and come back with some feedback as to whether they would consider implementing this as a shipping option. Heat sealed non permeable bags are the way to go. Lets try and keep the momentum going.