*BL SELECT* bikase sidewinder abc cage (black)

BLUE LUG selected bottle cage, "Sidewinder ABC Cage".

Flexible, and made out of light weight plastic.
This is the side entry version which you can use on small or lower top tube bikes.

With its adjustable dial, it can fit from 6cm to 11cm bottles.

There's long mounting points on the cage, so they should be able to fit as you like.
The stopper on the bottom is removable and can be replaced for ambidextrous use on either the left or right side.

Not only a plastic bottle, you could put even a wine bottle or a Nalgene bottle.

Also, you could carry multiple things other than bottles, for example rain ponchos or bike carrying bags.