LVWA Road MTB Mountain bike carbon fiber water bottle cage WS031L The carbon bottle cage features an all-new ultra-light (20g) design engineered for flexibility and strength. Optimized for both side and direct bottle entry the cage provides easy access , especially on smaller frames and those with tight angles. The result is worry-free distinctive WS031L style and efficiency. Thin-but-strong arms flex for easy bottle insertion and removal, at any angle.