Quote Originally Posted by mimitabby View Post
you could use the back pockets just fine on a horse. YOu aren't leaning on anything with your back, so there's room there to hold your stuff if you need to, and if you don't, just don't use them.
Not a good idea. Depending on the discipline, things could fall out. And just like you can injure yourself falling off with a 2way radio or cell phone on your belt, it would not feel good to land on whatever you might stick in your pockets.

Cycling jerseys are not cut properly for upright body positions. It will not fit correctly for horseback riding. Just stick with athletic fabrics in traditional shirt styles.

I have to ask, why are you using a camelbak on your horse? Are you out on the trails all day? I can't think of anything less comfortable for general range of motion purposes, not to mention how awkward that weight would feel.