I coach PAL and have spoken at with other coaches. Proper team size is 23:
2 lines for Attack
2 lines for Defense
3 lines for Middy (they run more)
2 goalies
Add 1 or 2 extra kids in case school sports, family activities, injuries, kids's quit or just life in general and you have the ideal # of kids on a team.
The backup goalie and 3rd Midfield line may not get any play, but that is what you sign up for when you play travel lax. | 
