Use for any XL eggs, duck, peafowl, goose, & turkey eggs with great stability. Holds up to 12 eggs. We recommend using pads between each shipper. Will fit 2-3 deep in the #7 box so you can ship 24-36 eggs per box. 3 in the box is tight. These shippers fit in a #7 USPS priority box.
https://store.usps.com/store/product/shipping-supplies/priority-mail-box-7-P_O_BOX7
 
12" x 12" x 3"