/diy/ - Do It Yourself

OP here, I'm starting to think this tread is becoming a bit too scattered so I might make a more specific thread if this one dies.

Anyway, what I'm looking at now is how to make custom shaped ice bricks to fit my vest in the OP. I've tried soft icepacks and they won't stay in position (slump to the bottom), hard ice packs are too flat and don't allow the vest to conform properly to my body.

What I want to make is a pair of curved icepacks. My first thought was to take a heatgun to some flat icepacks and try to bend them, but I'm not sure if that's going to work.

The more labor intensive option would be to melt down some milk bottles and remold them into the shape I want... problem is I'm not sure how to mold something with a cavity inside it, especially something that has to be water tight.

Third option would be to cut and bend a perspex panel to the shape I need and attach soft icepacks to it. I'm thinking this would be the most practical option.