This kit has enough panels to insulate 10 Large USPS Flat Rate boxes.
These 6 panels (4 sides, top and bottom) insulate your USPS Large Flat rate box.
These panels are 5/8" thick EPS foam panels.
These ship flat in a box to save you shipping cost over our USPS Molded foam boxes.
To be clear these are the FOAM inserts only. NO BOX IS PROVIDED.
You can order your USPS boxes for free online at USPS Boxes
Inside Measurements after inserts are installed 10¾ x 10¾ x 4¼
These are perfect for shipping temperature sensitive products.