i have that exact set barbakane, and so far I am loving it. I still keep the cups nested inside for coffee. And coincidentally for those of you who mentioned a lid for the sierra cup, if it is the right size cup, the lid off the stanley cooker fits right on the sierra cup, at least it does on mine anyway. Well, mine is not a genuine sierra cup, it's one of the generic ones from wal-mart. I add the cup to my set as it nests right under the cooker, and i can be eating/drinking from the sierra cup whilst heating up more water for others in the group if needed.

no affiliations other than as a happy user of the product(s)
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Uh ... does anyone have a match?