The larger size. (I believe it's 1.6 liters) The smaller size simply won't hold enough liquid volume. If it were for only one person, the next size down would work fine, but it wouldn't work well for two. As far as being small enough for an emergency pack, that is very subjective and I can't answer. I can say I'm taking this particular pot in my luggage across North America (travelling light on public transit) because it will store all my basics. (A few spices, a bandana, Vargo wood burning stove, fuel gel, wet fire, matches, Leatherman multitool, compass and small headlamp.)
Elaine S which one are you traveling with the 1.1 or the 1.6 ?? sorry I am confused!! :)
BETH O The 1.6. The little extra space it provides is perfect. It's surprising what can be stored in it compared to the 1.1.