Sometimes the simple things in life are satisfying too - case in point, your favorite soap brand (note other brands are available lol) If you get annoyed by seeing soap at the bottom of the bottle, but not being able to get it out due to the suction spout being angled to avoid blockage. Simple - turn it upside down on top of another bottle.

This is fine until if falls over and just a big mess. Enter the soap bottle docking connector - possibly the simplest model on thingiverse, but one that I have been asked numerous times to print out for friends.

Hope you too find this useful.