I use the MSR Titan kettle, 850ml. Want to take off the wire handles and the piece that holds them on. I--strong language here--despise eating from pouches. Never mind the mess. I don't like having a stinky bag with any amount of food particulate in my trash. Two cups of water for a meal, plus the food itself, this is a perfect size. Using a modified pot lifter in place of handles; more streamlined and less futzing IMO.
Roger, given that most of the meals I eat take two cups of water, then add food... there's no way I could get enough water in 900ml for two people, let alone cook the food. My 1.3L is just big enough...