It's always a good idea to upcycle single-use plastics, and finishing a squeeze ketchup bottle gives you the perfect opportunity. Here are some ways to use it.
Rocket will NOT fly straight without an aerodynamic nose cone made from a second soda bottle and use only 1 cup (200 ml) of water. Kit includes StratoLauncher IV, StratoFins, ball head ...
Pill bottles are made up of a stronger plastic material that makes it difficult to recycle with the normal curbside garbage ...