In my Sprinter van I keep a Mark I pair of Swaro 8x32s. The Mark II version is my main working bin, so it's usually with me when I'm camping. The older Mark I is there as a backup or a loaner for research assistants. It saves the day at least twice a year. In my boat I keep a Kowa BD II 6.5x32. The 6.5x power is quite stable in a small boat. In my regular car I keep a pair of Zeiss Victory 10x25s. The 10x25s were relegated to car duty when they were replaced by Swaro CL Curio 7x21s, which are the bins I keep with me when I'm not working. Bottom line: I'm never anywhere without a bin, and I seldom have fewer than two on hand at any given time. Of course, my work involves using binoculars, so it's an occupational hazard. My bins are tools that are put to hard use, and I just can't afford to lose research time because I don't have a spare on hand. I learned this the hard way on a trip to Baja , long ago, when my Zeiss Victory 7x42s fogged.