Mylar Bags are a great, low-cost option to package product. Our bags feature a reclosable zipper and are also heat sealable to prevent tampering. Our thick, heavy duty 5.11 mil mylar bags are superior in quality, and are made of PET/PE plastic. They meet state requirements for all states including Washington. Our heavy duty barrier bags are great for packaging for herbal substances, flowers, edibles, and even concentrates.