An idea I had as an alternative to the popular Altoids tin for a Personal Survival Kit container:
Ken_PSK1.jpg
Most pet stores sell these "Kitty Kap" lids that fit several different size metal cans from small 3 oz cat food such as the popular Fancy Feast (or similar BPA free alternatives) up to a larger 16 oz as shown in the photo (actually 20 fluid ounces filled to the brim, and possible to find BPA free but not easily).
So you can fill these with all your critical PSK items such as fire starters, tinder, First Aid, Water Purification Tablets, a razor blade or even a small folding knife in the larger metal can, fishing gear, snares etc.
Then seal around the bottom of the lid with tube of silicone from a hardware store for extra protection. Wrap duct tape around it because that is useful for 1001 things and will for sure keep the lid on. My 13 year old says she cannot get these lids off a Fancy Feast or similar cat food can with no other sealant added so they fit fairly snuggly as is. But I like to play it very safe.
The other brand I tried "Top Paw" is terrible both the plastic and the silicone do not stay on very well at all, don't waste your time or money. Also as you can see from the photo I cut off the extra plastic for use with the small 3 oz can, but made the mistake of cutting from the top down. It still worked but would be better to cut from the the bottom up to maintain as much of the seal as possible. Use a new sharp razor in a utility knife on cutting board or whatever works best for you. Cut wide then trim in close or do not cut at all, not really necessary.
Obvious advantage of using a BPA free metal can is that this is a cooking pot or possibly a wood stove. Use to purify water by boiling on a rock beside fire or cook your food in it directly. If a cheap metal can is kept dry while not being used it can last for a long time. I have not tried cutting off the top of a metal water bottle, or aluminum can/bottle with rolled top, but you may find some that are the correct diameter, because getting stuff out of a necked down bottle is difficult.
Comments are welcome, this is a idea in progress. Many pros and cons. Issues to be resolved.
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