Closed system with minimal splashing, easy to fill while riding Upper bottle carries 23 ounces, lower bottle carries 27 ounces, for a total of 50 ounces Designed to slide on to most standard aero bar set ups 2"-2 1/4" clearance is needed between aerobars, maximum width can be no more than 4" Translucent water bottles so you can see your fluid levels at all times.

For more info: http://www.trisports.com/rehysy.html

I'm in NYC area, willing for pickup to save on shipping