Our RSVP Compost Refill Set will help you continue composting. This set includes a set of two charcoal filters and a box of 50 RSVP BioBags. The charcoal filters help prevent odors from escaping your compost pail between trips to the compost heap. A set of two filters will last up to six months. The GMO-free bags are made from a compostable bioplastic. They will compost naturally along with fruit and vegetable scraps.