No box. No Tape. No void fill.
All you need is Xpander Pak, the best protective mailer for delicate or temperature sensitive items. Xpander Pak is the cushioning-on-demand often used for shipping pharmaceuticals, foods, lab samples, beverages, and any products that demand superior protection.
Xpander Pak

These mailers store flat, but after you insert your item, seal, and simply puncture the outer envelope, they expand up to 300% to ensure your package arrives safely at its destination.

Xpander Pak® foam expansion mailers are manufactured by Frontier Packaging, right here in the USA. Available in multiple stock sizes and foam thicknesses. Custom sizes are available for larger orders.

Watch the Xpander Pak Demonstration