I needed a couple of sleeves for the bottles I carry over with me to the supermarket on my bike rack. It's better to avoid putting two or three glass bottles together on the bike crate, they tend to hit each other.

I have also created a more easily customizable dual bottle sleeve

The Sleeve was designed in OpenSCAD, I am a very novice user. A couple of things are adjustable, i.e. diameter, thickness, height etc. Feel free to remix or enhance anything you like. I will be printing it out using PLA for a fit test, but I believe TPU filament would be better.

openSCAD has been updated a couple of times, please make sure you are using the latest version.