that works well- also Marla has spectacular ideas when it comes to this stuff so she'll be a good responder here. Another way is to get a disposable tupperware deal and use that here is a link to the good old DIY
Humid Hide
http://www.ball-pythons.net/Sections...39-page-1.html

Humidifier
http://www.ball-pythons.net/Sections...41-page-1.html

Here is a pic of my set-up - You can see I had to contact paper the lid, I have a thermostat and human heat pad and also a human humidifier (this pic was taken during early spring/late winter) that can be set for a humdity percentage (in my case 60%) the human humidifier is on the left - got it at WalMart I believe, also I moved my guy into my closet so it would hold heat and such better but you're using sterelite so that shouldn't really be much of an issuse