I have a good, still looking for mobile use. With the Zeiss Dialyte I've found it. It still fits well into the backpack and provides excellent optical properties for use in nature. Until 30x can grow there in de hand, then at least a monopod is recommended for stabilization.
+ Optical Power + Operability + Mobility
I would recommend the spotting scope to all who want more than a pair of binoculars.