Thanks, Mark. I am looking at weight & volume a lot more carefully now because we are moving from base camp hiking to following multi-day trails.
I thought 1.8L might be cutting it a bit fine, so I'll look at one bigger pot or two pots, as you suggested. Thanks also for the potato salad container tip. I hadn't thought about those. They are stronger than a regular takeaway container and will nest nicely (and are very LOW cost!).