Separate post so I don't drift the "Make My PSK Smaller" thread.

Several of you mentioned your stainless steel cup in that thread, much like one I currently own. I want to upgrade to a titanium cup (with folding handles), one in which a Nalgene bottle will nest.

My dilemma: single-wall or double-wall? I'm considering this...



...or equivalent, whatever will work with Nalgene bottle. I want DW because my experience with DW stainless cup is that it keeps contents warmer, longer (granted, downside is that it packs larger).

But, I'm wondering how a DW cup will perform when used as a cooking utensil, or to boil water. Does the DW-construction appreciably increase the time to boil/cook vs. SW-construction? For that matter, how does titanium itself influence cooking efficiency vs. SS, if at all? (I'm trying not to let the significant price difference influence my decision)

Thanks for your feedback.

Dan