Any of our XLAB cages will fit the system. There are quite a few parameters that need to be be met with other cages in order to work with the bottle. So I am not saying there aren't any out there it is just we have not tested them all.
The parameters I am referring to are: the height and width of the bottom hook (in order to fit into the rear of the bottle), the height of the sides (so they do not interfere with the dolphin tail), the top hook of the cage must align to the groove on the bottle, and the thickness of the spine of the cage (although screws can be bought at a store to compensate for this).
Which cage were you trying to see if it would fit?
Candice Turner
CEO
XLAB - Aerodynamic Triathlon Accessories
Dawn to Dusk - Off-road Specific Storage Accessories
http://www.XLAB-USA.com http://www.dawntodusk.bike