What is someting surprising is having a look at pot dimensions / theorical volume according to the maker.
calculating this with water up to 1cm from max height gives :
brand / theorical volume / calculated volume / weight.
BPL1,1l : 1,1l for 86g , 3 oz
MSR 1,3l : 2l for 188g , 6,6oz
evernew 1,3l : 1,2l for 120g , 4.2oz
Snow peak 2l : 2l for 194g, 6.8oz
MSR 2,4l : 3,4l for 262g, 9,2 oz
MSR 1.3L pot dimensions gives 2l volume where is the error ??
so far snowpeak 2l cook and save without the plastic cover seems the best option.