Ad says: The Art of Flavor The Perfect Jar to Cure your MMJ Herbs in The Four Factors of Lost Flavor Trapped CO2 Light Air Moisture The key to rich, full-flavored Herbs is limiting the effects of these external forces through proper storage. Your Herbs lose flavor with exposure to light, air, moisture, and carbon dioxide released after the drying process. The Friis Herb Savor keeps your Herbs fresh by locking in flavor while blocking out light, air and moisture. The Friis Freshness Valve vents away flavor destroying CO2 gas. When stored in a cool, dry place, your Herbs stays fresh longer. The patented Freshness Valve is the key to eliminating trapped CO gas. The valve is constructed with a unique filter that allows carbon dioxide gas to pass through without allowing oxygen or other gases back in. This one-way valve removes the trapped gas that breaks down and destroys the herbs flavor over time. Herbs are perishable much like fruit, milk or bread -- keeping herbs fresh is very important. Without a freshness valve herbs can not be kept fresh. Going to do a triple test, 2 oz dry in, 2 oz dry curing old fashion way and put in, 2 oz dry cured old fashion way and kept in their glass jars.