Our side-entry bottle cages provide easier access to your water bottle. Compatible with all trikes we currently sell. To mount this one of the Edge or Zoomer models requires one of our water bottle cage brackets. All other trikes have mounting holes for one bottle cage (two on the tandem). To carry more water, add another cage as well as a bottle cage bracket and attach it to the ribs on the back and bottom of the seat. You can attach four per seat. Another hydration approach is to put a water bladder in our seat bag which slips over the seat directly behind your neck.