Product design is the starting point for any circular product or system. The list of attributes that contribute to circularity is long and bounded only by the imagination of the designer. Desiging a product that is repariable by not gluing pieces, using minimal screws, and ensuring parts are available increases the longevity of a product and its suitability for leasing or other sharing business models. Using only as much material as needed for the product function (lightweighting or dematerialization), minimizing the number of different materials used, and making sure the material selected can be recycled or reused allows for recovery and regerenration of those raw materials. Employing techniques like biomimicry, where products and systems are patterned off those found in nature, can also help make a regnerative system.