modified to fit 32 oz Camelbak Eddy. Basically increased diameter of the opening and lengthen the whole thing.
I tested this on my indoor trainer and its very secure and feels pretty strong so far. I can force the large bottom of the bottle into the smaller opening and it'll flex enough to work, I can also place the bottom of the bottle on the bottom of the cage, and then slot the bottle in between the arms and it also flexes and works. Haven't tried it outside.
Design is far from perfect, maybe someone more skilled than me can add a curve to the bracket, because right now there's a gap from the curve of the bottle
The author remixed this model.