Pound Bags : PRESSURE PACK (Kush Mintz) Mylar 1lb Bag Items are Non-Refundable and Non-Exchangeable. Pound Bags : PRESSURE PACK (Kush Mintz) Mylar 1lb Bag In its basic form, Mylar® is a clear material made from polyester resin. The silver effect comes from a lamination to foil or a metalized ...