I use those small 2 1/2 gallon aquiarium. Thy have glass dividers and can be divided into three small sections. I cut a notch in the middle to divide them in half and it can now house two giant asians just fine.
It depends on what molt their on. L1 to L4 can be housed in a 24 ounce container, and above in a 32-80 oz. countainer. You can find them here, at www.mantisplace.com