Insulated Shipping Box appropriate size

[Adam Chandler]

This may be a stupid question but I'm getting ready to order some shipping boxes and I'm wondering what a appropriate size shipping box for a BP hatchling about 1-3 months old?

Would a 7x7x6 box be big enough?
http://www.tsksupply.com/products/7x...pping-Box.html
If so what is the biggest size BP (I guess in grams) you would ship in this size box?
And at what size would you bump them up to a 12x9x6?
http://www.tsksupply.com/products/12...ping-Box-.html

Also, is there a huge differance between 1/2 inch foam and 3/4? Is 3/4 really necessary or is it overkill?

Thanks in advance guys, I appreciate any input.