The Bee Nester System 100  comes in  a  cotton drawstring bag (reusable for summer protection of cocoon filled Systems) The 100 each Bee Nester System are the three assembled parts  (water resistant coated cardboard tube (reusable),  liner and reusable end cap). The Bee Nester System is a favorite of many backyard Orchard Mason Bee keepers  for its ease of maintaining mason bee cocoons. Our Bee Nester Systems offer the highest protection for the Orchard Mason Bee from predators