I will be experimenting with a new round tin which used to contain milk powder and is more or less air tight and waterproof. It is a milk sample tin from the milk company (they hope for me to recommend the product to my patients).

You could probably fit quite a fair bit of PSK equipment inside and have a nice compact waterproof kit which you could cook boil water in. Somthing like the 'you CAN survive' tin.

See the pictures below.
Inside is a Huntman Lite SAK for size reference:







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Trusbx