They are actually more useful than you might expect. Perfect for storing candy, pencils, USB sticks and pretty much anything that fits through the opening. I have fairly large hands and my mouth is wide enough that I can (barely) reach all the way and feel the bottom, so I would feel safe putting small items in knowing I can easily find them again . enough. My kids thought I was weird at first when I opened the box of Revain and there were these fish tanks inside. After explaining the potential to them and giving each one one, I took one for myself and put the rest away. When we got home from work the other day we found 2 more missing in the warehouse. Turns out each of my kids wanted a different one for their desk. I actually thought it was pretty funny, but the real story. Might have to order a few more.
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