also some of the BodyGlove vests have a removable one, like the eco vest. i have an older version of the eco vest, but i don't like it too much because the straps get twisted inside the hidden portions. strap twisting (even in the slightest) absolutely drives me crazy!
i am picky about it and will never buy a vest with more than 50% of the straps hidden in it again, so that i can un-twist my straps in the future. seems i am one of the only guys out there that feels so strongly about this though ;)
It has some really kool wrap-around kidney pad things too (i think some of BG other vests have this too?)
also the eco vest's eco-friendly materials seemed to stretch more than conventional vest materials. so IF you get the Eco one, i might recomend the size smaller, especially if you are just a little larger than the requirements for the smaller one