I've got three of them from post-2004 gov't issue MREs. They are designed to be used with the MRE heaters, which won't _quite_ boil water, but get it to about 190 degrees F...my seven foot drop test onto the kitchen tile was conservative.
I've thrown them at my garage door from ten feet and not had them blow open.
What's weird is that the plastic used to make them seems to be the same consistency as the MRE heaters...not as heavy duty as an IV bag; about 3 or 4 mil. The ziploc is a standard ziploc type, just a bit thicker.
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein