From reading their patent (US5936178) the active in the pouch is a gel formed from an aqueous solution (containing salt or sugar) and a gel forming material such as sodium alginate (from seaweed).
The only problem I would anticipate in reusing them is that eventually the preservative may fail and the alginate could break down. When that happens the gel-like material could instead be more like a free liquid, which would certainly be more of a leak hazard. But if you rehydrate the pouch and it still squishes - go for it!
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