You won't be able to Vacuum Mylar and other Types of Moisture Barrier Bags with Normal Vacuum Equipment, to do that you need a more expensive Type called "Chamber Vacuum Sealers". This is due to the fact Plastic used for Vacuuming has ridges in it designed so it's easy to draw the air out of the bags, while Mylar does not have this. Now if your only intent is to use the Vacuum to Seal the Bags and nothing else this works fine. For a Demonstration on a technical work around ( although probably not not viable for large amounts of order ) see the following Time Linked YouTube-video: http://www.youtube.com/watch?v=4m1cbQK3Nj4&t=3m32sIf you don't want to use any Vacuum Equipment for Sealing you will need some kind of Heat to Seal the Bags, see for example my thread Heat Sealing Equipment: http://dkn255hz262ypmii.onion/index.php?topic=160856Also if you haven't done so already I suggest you take a look in the thread STEALTH THAT WORKS - DITCH THE PE FOOD GRADE VAC SEAL: http://dkn255hz262ypmii.onion/index.php?topic=119458