I went with a Ti kettle, just a bit bigger than a cup. Filled it with a Iso-Pro cannister (for my Pocket Rocket stove) and an assortment of tea, cocoa and soup stuff that goes well with hot water. The SS cup Lono mentions is good though, I have one of those on a nalgene bottle in the same bag. A little more weight, no wasted space.
Better is the Enemy of Good Enough.
Okay, what’s your point??