Write your question here...How does this kettle cup.. or any titanium single wall container hold up to cooking with direct fire/coals?

I agree with knanier. Titanium is all about light weight which means there will be some compromises. There will be some discoloration, particularly blackening of the pot on the outside (not a bad thing by the way) and as Ti gets hot, it also creates different hues of blue where the most intense heat is. However, the biggest issue will be deformation of the pot. Because the walls are so thin, if the Ti material gets too hot, it will warp which could effect how the lid fits on (with the MSR Ti Kettle, the lid is made to fit on snug allowing the user to pour without worry of it falling off. If the pot gets too hot, this may effect greatly how the lid fits). I would caution anyone from using Ti cookware over a fire or really hot coals. If you are careful and continuously monitor the pot as it cooks, then you should be fine. It will take a little more care and attention... The best material to use over open flame or coals is stainless steel. MSR's Stowaway Pots are excellent and are used by NOLS and various wildland firefighting crews in this manner.

I've used this specific one to cook over a good set of coals a handful of times on a trip when a stove malfunctioned. It did just fine, but it was certainly discolored (as I'm sure anything else would be) afterwards. I'd still be cautious though, as the titanium is still fairly malleable. FYI - I only cooked noodles and boiled water - nothing complicated.