What this is built for
One person's share, with a number on it. Mission trips are priced per traveler, and that's an advantage. "My $2,800" is a clearer ask than "our team needs the full amount," and the person reading it knows exactly what they're covering.
The list you already have. Family, your small group, the people who've known you since you were small, your church directory, your coworkers. The support letter assumes that list exists. It does.
A date you can't move. Registration closes, flights get booked, the team leaves in June. A trip has hard dates, and so does the ask.
Contributions start at $100. That's the scale this is built for — a grandparent covering a twenty-eighth of a trip, your old boss covering four of them. Twenty-eight people and you're going.
Trips that aren't mission trips. A school trip to Washington, a choir tour, a band competition, a semester abroad, a service trip with no church attached. Same shape: one person, one number, one list.