you know you can call them and tell them that you are looking for boxes to ship corals and you are not sure what size you need .... ask them if they can send you a couple differant sizes and they will send you a couple of boxes as samples at no charge.... just so you know what size they are and how they are made...... thats what i did and they sent me 3 boxes and also some heat packs for nothing,,,,but i dont like thier heat packs... you can use them for heat or cold... just put them in the microwave to heat them up...but the dont hold the heat long enough....i like the boxes you can get and put the styro panels in over the solid coolers in the box..... cause heat packs need oxygen to work properly..... the solid coolers in the boxes are sealed to air-tight.... if you use them you have to take a pensel and poke a hole through the box and styrofoam so it can get air so the heat pack can heat up to its full potental...if not the heat pack does not heat up to its max temp...at least with the syro-panels the corners let air flow in.... just my two cents
