Hike..there are several sizes of those cups.i have three of them,the old Sierra,one about the same size made from titanium and a larger one sold by REI and others as a "jumbo".just using the cup as it was intended,a "do all" cup/cooker,the zip lock in a pocket or shoulder bag is the way to go for boil-ups.for a survival kit that you want to keep sealed and put away in a boat or car what i would do is fill which ever one you prefer,i would use the jumbo,and seal it with one of those high end vacuum sealer,the ones with the electric pump and not the hand gizmoz.you could compress quite a bit of stuff in and it would be air and water tight until you really needed it.well that,s a winter project i just made for myself!!!