north-north-west wrote:A pot big enough for two people is too big to carry. Besides, you'd never be able to eat them both at one sitting and, unless you're up in the snow, they'd go off pretty quickly.
I have seen a cooking pot big enough for at least two people in a museum in Lagos, Nigeria. I agree that it would have been too big to carry. Mind you it was ceramic. A modern titanium version might work, so long as it's an open track with no scrub or forest to walk through.
But back to the other interpretation...
A bigger pot will actually boil a small amount of water faster than a smaller pot in some cases. Ie, if the bigger pot is wider, it will transfer heat from the stove into the water much more efficiently than a pot with a narrow base. Not much heat enters the pot from the sides, it's mostly from the base. I sometimes carry two pots (for cooking meals with a main and a side), and if I'm simply boiling water for a single cup of tea, I will use the bigger pot as it boils faster. If I'm carrying only one pot, I will usually take just the bigger pot because it doesn't weigh much more, and I can store the gas canister inside the pot, which makes for better packing anyhow.