Medium: holds 1/2 lb of coffee | 24 oz | 3 cups | 0.75 qt | 709 ml Large: holds 1 lb of coffee | 46 oz | 5.75 cups | 1.4 qt | 1.36 l Air takes out the freshness…so EVAK takes out the air. The longer your food is exposed to air, the faster it loses flavor. Glass containers with air-tight lids are readily available, but they trap stale air in with your precious food. Evacuate the air and keep your food fresher, longer. Our twin valve system automatically forces the air out as you push down the lid, and lets you easily pull up and remove the lid. It's so simple-just push down, then pull up; no buttons or levers. Perfect for coffee, tea, dried fruits, granola, herbs, etc.