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no not that kind. i need a lightweight bowl(8 cups or so). how do those folding bowls at REI do? worth the money? i like instant potatoes, but am looking to shed my current mess kit.

Those folding bowls are neat, but I don't think they hold 8 cups, maybe I've only seen the small ones?

I have an orikaso bowl. It's not 8 cups, but it's neat.

I use the Orikaso coffee cup and the discontinued version of the Orikaso bowl. I thought they were gimmicky when they first came out, but people I respect seemed to like them so I gave them a try. I'm glad I did. When they unfold (flat), they take up practically no space and will conform to the outer curve of the food bag or other such space.

Could you merely add the potatoes to the pot in which you heated the water?
I sometimes use a Gatorade/Powerade bulk powder container as a bowl. (it's likely only about 3 cups, though.. maybe TWO!) A Reflectix 'coozie' will keep your spuds warmer longer.

If you want to go really MacGuyver you can use a few layers of molded tin foil. Cheap, light, and effective