You can design your own mylar bags for your brand or simply buy one of our pre-designed bags. Our custom printed mylar bags are of durable, strong, and long-lasting quality. Is Mylar safe to cook in? Please do NOT put boiling water into wholesale Mylar bags. Mylar bags are made of several layers, and the bottom one is usually a plastic such as LLDPE. ... It would most likely not be harmful, but boil-in bags are boil-in bags for a reason...they are intended to be boiled, while your typical Mylar Bag is not. Can you print on Mylar bags? Printing on custom Mylar bags is very cost efficient and easy. ... Inkjet printers in particular allow for an unparalleled ability to digitally print these custom bags. What Colour is Mylar? No actually Mylar is not silver, Mylar is translucent. Mylar can be coated with a metalized film to make it appear silver. Mylar films come in many colors including white, black, silver, gold. blue, clear, brown, and other custom colors.Supouches stand up pouch manufacturer constantly strives for innovation. Food packaging bags packaging has reliable quality, stable performance, good design, and great practicality.