Pirate Ship is the only shipping software that passes through the cheapest USPS rates available for free, with no markup, fees, or minimum volume requirements. To be clear these are the FOAM inserts only.Priority Mail Cubic is the cheapest shipping service for soft pack or padded envelopes, but other shipping software add tons of markup on top of the actual cost. These ship flat in a box to save you shipping cost over our USPS Molded foam boxes.

These panels are 5/8' thick EPS foam panels. (12x12x8) These 6 panels (4 sides, top and bottom) insulate your USPS Priority Mail Box-7. This kit has enough panels to insulate 44 USPS Priority Mail-7 boxes. Hazardous materials (HAZMAT) might be prohibited or restricted. Also, there are some things that you can’t send at all (prohibited) and other things you can only send under certain conditions (restricted). $17.10 Priority Mail® Forever Prepaid Flat Rate Large Box Includes Customer's Return Address 12-1/4' (L) x 12' (W) x 6' (H) $22.80 Step 1: Ask, “Can I Send This?” The maximum weight for a USPS package is 70 lbs.

Usps priority flat rate padded envelope