The product we tend to use is possibly described as "not so techni ice"!
My everloving spouse recycles her used wine bladders (and there are a few of them

), slowly drains them out, (this can take up to a number of nights!) refills them with water and freezes them. (You will easily work out how the stopper can be disassembled.) Has similar effects to techni ice (contained and reusable) except that should it eventually leak it is only water, or in some cases salted water.
She also houses them under an aluminium cake tray on the bottom of the esky (when we use an esky) and this not only insulates the "ice pack" but also keeps any foodstuff stacked on top away from any leakage should same occur.
Regards
Glen
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