Optimists and pessimists die the same death, but they live very different lives. Shimon Peres said that, and we agree 100 percent! Our beautiful lime green Be unreasonably optimistic mug is a practical reminder to see the silver lining in every situation, and to practice unreasonable optimism. Ceramic mug holds 14 ounces. Microwave safe but please, we would be grateful if you would hand wash your mug. This mug is one of a set of four of mugs. Check out our Be unreasonably happy mug in orange, our Be unreasonably kind mug in bright red, and our Be unreasonably grateful mug in deep blue.