I bought a few of these the other day after seeing a friend of mine use them; they are $25.00 a piece at the The Container Store. Just drill a 5/16 whole in front of the drawer and use a piece of dowel to keep it locked and you won't get escaped ball pythons, then 3 or 4 inch flex for belly heat. Or run 11 inch flex down the sides for radiant side heat. There is a strap that will lock the bins together. If you don't have the $2700 for a Freedom Breeder then these come in very handy and for a 30 bin rack you’re talking under $800.00 with heat. Put a Helix to it for safety and your set for under a grand. I have Females that are 1000 grams and above in them I wouldn't put anything less than 800 grams in them unless you modify it a bit more the smaller ones can get into the pocket but so far not out of the rack.
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