Not bad. Good info.
But everyone I know, especially in Canada, goes with a bigger box. I know I do. That box basically held a deli cup. I shipped out a box today with 34 deli cups in it!! And I use the SAME size box, even if I had 3 deli cups in it. I cannot bear to think that the snakes will be closer than 3 or 4 inches from the heat pack and/or gel pack. That scares the bejeezus out of me. People that I've shipped to know what I'm talking about. Remember how I packed it? That's how most people I know do it. Heat and heated gel packs on one side, snakes on the other side. Works like a charm.
Not saying his way is wrong. Just saying I wouldn't do it that way. But the box construction is perfect. That's the way its been done for 20+ years. No better way to do it.