Thinking about how much oil we're using these days? These mugs can help change that! While most plastic is petroleum-based, these mugs are made in the USA entirely out of corn grown in the USA, so they are not only safer but local as well (or at least national)! Not only that, but they are BPA-free and will disappear in a commercial compost in three months. But not just yet - first enjoy carrying around your favorite beverage in a mug that is safer for you and better for the environment. Each holds 16 fluid ounces.