MSI Classic offers a competitive level of play for players in age groups U9 through U19. It is both a “select” program, in which players must try out and be selected for teams, and a “house league”, with all teams, players and coaches participating as “members” of the MSI organization. The Classic League embraces and promotes the same values and principles as other MSI programs – each child’s enjoyment, skill development, personal growth, passion for the game, team experience and sportsmanship. MSI Classic teams are deemed to be organized by and for the benefit of the youth players that make up each team.
| Age Group | Format | Roster Maximum | Secondary Carded Maximum | Game Length |
| U9 | 7v7 + Build-out lines | 13 players | 3 players, 4 non-Classic Assessed players allowed | 2×25″ |
| U10 | 7v7 + Build-out lines | 13 players | 3 players, 4 non-Classic Assessed players allowed | 2×30″ |
| U11 | 9v9 | 16 players | 4 players | 2×30″ |
| U12 | 9v9 | 16 players | 4 players | 2×30″ |
| U13 | 11v11 | 18 players | 5 players | 2×35″ |
| U14 | 11v11 | 18 players | 5 players | 2×35″ |
| U15 | 11v11 | 21 players | 5 players | 2×40″ |
| U16 + | 11v11 | 26 players* | 6 players | 2×40″ |
