The simple cup (titanium) became one of my quests last winter. Here's my Snow Peak Trek 700. Weighs 4.8 ounces. No more day hikes outside the Beltway without this cup/pot in my pack.

http://www.rei.com/product/708071/snow-peak-titanium-trek-700-mug

This REI titanium "Sierra Cup" is with me whenever my dog is because it is her drinking cup. To my surprise, after years of carrying them online and in their stores, REI is not currently selling this item. They are still selling a stainless version.

http://www.rei.com/product/607224/evernew-titanium-sierra-style-cup