Oversized windows entice recipients to find out what’s inside

Back in vogue are oversized-window envelopes that give recipients enough of a peek at the contents to convince them to open it.

The Wilderness Society — a Washington, D.C.–based nonprofit — adopted the larger windows for its bimonthly donor recruitment package, which it mails 2 to 3 million of annually. It now places the traditional single envelope used for the prospecting piece inside another envelope with an oversized window. And donors have taken notice.

When the double-envelope approach was tested against the single envelope, the oversized-window piece produced a 35-percent higher response rate, according to Robin Hickman, the group’s director of membership services. She adds that a subsequent test also generated a higher response rate, proving that doubling your efforts really can pay off.