It will be a deep wilderness area, out 6 to 8 days. Although I use a humidifier, I can do without, so that wouldn't be an issue. Doesn't sound very promising though and I won't give up the hunting. I can't believe no-one else has come up against this.

Ok, lets take this a bit further. I am planning a wilderness hunt, so unless the horses come with batteries?????? Anyway my thought was a Li battery and maybe solar panels, but I think the charge time might be an issue. any thoughts?