I'm looking into shipping ball pythons way in advance, and I can't seem to find fixed info on this. Noob questions.

For ball pythons ranging from hatchlings to 1000g, what size cloth bags, shipping box, and insulation foam thickness do you use? Any other things I should get besides these? At what bp size do you bump up all the shipping box/cloth size?

I'm looking at tsksupply right now. Is that the best site to get this stuff? Is there a better/cheaper one?

Is it more worthwhile to just get the "reptile shipping kits" on the site if I'm just going to ship something like 1~4 ball pythons in the future?

Also, does everyone use shipyourreptiles.com as the best way to ship? How quickly can I be certified to ship through here?