While it may not be a pocket-sized solution, how about a pouch-sized one such as a mini bread tin? Look at this: http://www.amazon.com/Set-Mini-Loaf-Pans-Inch/dp/B002UF8YCY .

Those could fit in a small MOLLE or similar pouch. There is a guy who built a "survival" kit out of one.

Standard Disclaimer, YMMV, IMHO
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor