Some of the MSR deep plates and bowl nest with their pots, either inside or outside. But that would mean that you do not have two of the same exact ones as they do not nest as pairs. I have some of their plates, but they are too wide to work well for soup, have not used for several years.
https://cascadedesigns.com/collectio...tchen-utensils

This is the MSR bowl. It nests inside some of my my pots.



Or a large mug? The smaller one shown here is on the small side, but worked ok for a hot freeze dried breakfast.



The one above is titanium and I have used it also as a small pot to make pasta sauce. There are taller ones made of aluminum or stainless that also work well as a bowl/mug.

But if you had two such mugs, they do not nest with each other.