Since my PSK is carried in a pouch on my water bottle carrier (which carries a steel cup and usually a steel bottle), the biggest use I find for the aluminum foil is as a moisture barrier under the start of a fire. We have a lot of ground moisture at the best of times around here, to.
If I was going to try to count on it is a container, I would want to roll it around something for storage.
I have heard of using foil as a fire barrier. Never tried it though. Really to get the best proformance out of it one would have to make sure to take care in storing it. If it starts to look worn or weak points begin to form then it's time to replace. I guess that goes to say that your PSK is not one that is sealed and never openned. I guess it could be safe to say that when it's time to replace any items that have an experation date. It's also wise to check everything else and see if all is in working order. A little maintenance never hurt any one.
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