If you plan on ordering many boxes why not save yourself some money and buy bulk? http://www.tsksupply.com/ , http://superiorshippingsupplies.com/
12x9x6 is what I use for hatchling larger animals get larger boxes 15x11x7 and 16x16x8
As for snake bags I use 8X12 for hatchlings and 12x20 for sub-adult and adults.
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