I still have my sierra cup from back in the 80's (IIRC). I fondly remember using that thing as my only cup/bowl/plate on many trips. I suppose how I currently just eat out of my pot and use a ziploc bowl as a mug is a natural progression from that earlier minimalist state. I am planning on doing a trip using my old gear sometime just for funs sake. I am sure I will bring my sierra cup along for that.