The Tri Bottle Cage Carrier. Full carbon fiber weave; matches your favorite Apollo Cage. Keep your bottles right where you need them, in the airless area behind the seat. The Mercury comes with 4 mounting holes and super flex arms so mounting is super easy. Also the Mercury is large inside so your bag will actually fit in. Carry your spare tube and the bottles you need. All at a great price! 125 grams including hardware.