I was thinking of drilling holes into a five gallon bucket all over and lining it with a thin black cotton t shirt on the inside. But that will still heat up.
Or..... You could drop a few bucks on
www.geopot.com ........ they are made of fabric, have handles, are durable, and when I bought these at hempcon, the guy said "I garuntee you 110% they will give you a better quality plant that anything else"......
I had a few ladies inside the grow space and they were all very stressed except the geopot girl. She was smaller, but her quality went unmatched.
I just checked geopots site and you can't go wrong. They are inexpensive and you will be amazed of the quality of the fabric durability and how easy they breathe.