Chronicles of Canddy Man Mylar Bags 3.5 Grams Mylar bags keep your weed investment in tip-top condition. They are the perfect bag to store your produce and preserve its freshness for the longest time. Mylar bags are heat-sealed, reusable airtight bags designed to create a strong barrier between your produce and the outside environment. Operation is as simple as placing your weed into the bag and sealing it. Mylar bags are most commonly used for long-term storage of dry, dehydrated foods and herbs. By eliminating residual oxygen, it becomes the perfect bag for long-term food preservation. Therefore, the long-term effects of heat, light, moisture, and oxygen are greatly reduced or eliminated.