Hi Chris,

Your local rack guy here...

I use the 1/8" spacer so the bin and tape have minimal friction. You won't have to worry about any of your balls escaping. You can also use 28qt sterilites as well. those will fit exact since those bins are 1/8" higher.

I built my 9-bin rack the same way and humidity will hold and I have never had a bad shed... even in my bottom bins. I use aspen chip as my bedding.

Give me a call / text if you have any questions or concerns

Mike