Old 06-17-14, 09:00 AM
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IMO, neoprene is kinda heavy, and not the best insulator for its thickness and weight. What I would try is aluminized double walled bubble pack which can be assembled into a pocket to fit a bladder using tape to join the pieces. Home Depot, Lowes, TrueValue all have it. It may not be that durable but it's very cheap and easy to make another. Use two layers for more insulation if desired.
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