Bogg bag type attachment to hold bug spray &/or sunscreen. Tight snap, but the spray bottles can also just slide in - it can be installed horizontal or vertical which ever is the best alignment for the holes. This uses a screw-type mounting for an easier fit through the bag holes, it may require a little stretch if the holes don't line up exactly, but it should work.
Screw hole mounts are about 12.5 mm ⌀ so just check the holes on your bag first.
Definitely use PETG or other higher temp resistant filament if it's gonna spend long days under the sun ☀
The author remixed this model.
changed the backing and converted it into a screw-type mounting instead of just a direct snap. This makes it easier to fit & mount onto the bag.