Most reusable menstrual (or "mama") cloth pads use size 20 regular KAM plastic snaps. We have a great deal on random or mismatched colors that are perfect for DFG kits.
Days for Girls is a non-profit organization with volunteers that make and distribute reusable feminine hygiene kits to girls and women in underdeveloped countries who would otherwise have no access to such basic supplies. Without these supplies, the girls and women would be forced to remain home bound, missing school and work and preventing them from being contributing members of their household and society.
DFG has chapters throughout the world. To become a volunteer, visit their site.