HydroTail Carbon Fiber Water Bottle Cage Holder. Mounts to back of saddle. 50 grams for the bottle cage holder, excluding hardware. Comes with hardware (upgraded to black 7075 aluminum bolts to mount onto saddle rails) Does not include any bottle cage bolts. Can hold up to 3 bottle cages and also you can tuck a spare tire as well.
Used once.
I am a roadie and thought I would do a tri. But am not going to. Selling for $70 or best offer.