Insulation fits USPS Box 12 x 12 x 8" . Their boxes are free. You can pick up at any post office or order them online and they will drop them off to you. Can't beat that! I use this for all my praying mantis shipping, summer and winter.
Insulation for Shipping, Large box full top
This Insulation is great for keeping your pets and feeder insects safe in shipping from adverse weather. (box not included). This insulation and a heat pack are all I use for shipping my precious cargo!