I have used Sterilite boxes with no problems. I drill several holes along the upper third of the box for ventilation. Take care when drilling as too much pressure can crack the plastic. Also, drill the holes small enough so that the snake can't poke its head into them to the point where it can get its eyes into the holes. I have seen eyes damaged from this. Place sufficient weight on the top of the container and make sure the weight is evenly distributed across the entire lid. A piece of plywood cut to the size of the lid with a couple of pounds of weight works well. An appropriately sized heavy book works well, too. I also make sure my containers are kept clean. With limited ventilation I'm sure that snakes appreciate this! You can even fabricate your own racks from plywood made to the proper deminsions for the Sterilite boxes. Hope this helps.
Jim