I made some too, and my mom wore a ziplock bag cooled on the garage floor around the house yesterday, she always feel overheated, and outside temps were 98 with 109 heat index, so the house was hot even for me.
I'm going to
pouch the rest up in sturdier bags with the no suction function of a vacuum sealer. I haven't worked outside, so I haven't tested it on myself in the heat, but if she likes it, I'm probably going to also.
The ziplock off the garage floor felt cool, but not cold. Putting it in the fridge was too cold, would have had to have several layers of cloth, and I was testing skin contact.
I'm calling this a win, and will be continuing with the experimentation.
:D