The all-in-one protective mailer!

Cushioning-on-demand, when you need it. Simply pierce outer film of the foam expansion mailer and watch as it expands up to 5x times its original size. "Lock-In" your product and secure the contents exactly where you place them, no void-fill needed.

Xpander Pak® foam expansion mailers require less space versus traditional EPS coolers and are an effective replacement for small shipments, clinical samples, etc. Whether you're shipping high-value components or temperature sensitive pharmaceuticals that require extended duration shipping time, Xpander Pak® can save you a bundle. In fact, for shipments under 1 cubic foot, Xpander Pak is a direct replacement for EPS Foam. Tough and durable on the outside, ultra soft and insulating on the inside.

Watch our Time Lapse Video demo of an Rx² grade mailer expanding then put to the test.

For official testing results, see our Assistance page