I definitely agree with @Katya above. It's hard to beat the Aegis Solo for a very well-built, waterproof, dustproof, and shockproof mod that doesn't weigh a lot. I love the Zenith tanks, too.
About this:
Taking the batteries along for camping/horseback riding...won't be a problem. However, I hope you have some kind of pack or bag to put the Jackaroo in while riding. You sure won't want to put it in a pocket (if it would even fit)...'cause your pants may end up falling down from the weight when you dismount...according to what people have said about its weight.
About this:
I want to take extra batteries for camping/horseback riding so external/removable batteries are best.
Taking the batteries along for camping/horseback riding...won't be a problem. However, I hope you have some kind of pack or bag to put the Jackaroo in while riding. You sure won't want to put it in a pocket (if it would even fit)...'cause your pants may end up falling down from the weight when you dismount...according to what people have said about its weight.