How to send letters through "pouch" mail

Elder Bryan Joseph Parry
Uruguay Montevideo Mission
P.O.B. 30150
SLC, UT 84130-0150
USA

Pouch mail instructions: Postcards and letters that are single sheet, folded into three-panels, and taped at the top only (no envelopes) may be sent through the pouch. Only costs 1 regular US stamp!