Because of the historic lack of an official divisional structure in men's volleyball, three of the four major conferences have members that normally compete in Division II. Before the creation of the Division III national championship, the EIVA had several Division III members, but all of those schools now compete in D-III men's volleyball. The Big West became the first men's volleyball conference to consist entirely of D-I members in the 2021 season; this immediately followed UC San Diego, previously a Big West affiliate in men's volleyball (as well as women's water polo), starting its transition to Division I and fully joining the Big West.