Plastic Storage Totes

Hi, Does anyone have suggestions for the separation of plastic storage containers, like Rubbermaid, Yaffa, and STERILITY? I just bought three 18-gallon tote when I have returned home, they are stuck, as if they were glued crazy! They are too big and too hard to try to "skin" to separate them. Help! Ideas? Thank you in advance for your help!

Put the ice in the interior, and put the external in a bathtub or sink with warm, if they are sufficiently large. Cold shrink inside, the heat expands the outside, and Presto!

If you leave it where it's cold, I think the temp. shrinkage.

If you have an air compressor and pull a little air at high pressure between them and that works every time.