My zebra is @ 16cm and similar to the rectangular unit on the PEARL website. It has a full volume capacity of 2 measured cups . This works out to the standard ratio of @ 1/2 cup rice to 1 1/4 cup water, oatmeal etc. My ESBIT has 2 additional side wind screens fabricated from aluminum cans that nestle nicely inside. with this setup and the lid fitted I can bring water to a boil easily with one tab and toss in the rice,stir and then with the last of the fueltab and gathered tinder simmer for a full 10 minutes. This is standard not minute rice; basmati, jasmine,brown or whatever the cute vegan I hike with feels like. It's a matter of thinking small container and big efficiency with these stoves. You will go broke using the esbit tabs exclusively. I find TRIOXANE is fussier to handle, but seems anecdotaly to burn better. Either way, after that initial boil from a fuel tab I switch to fuels just enough to maintain the container's heat for slow simmering.