We’re talking salad tubs, strawberry containers etc. This kinds of plastic can quickly mount up around the home. Why not have some STEM fun and turn it into sail boats?
SCIENCE: Explore floating and sinking. With older children you could introduce Archimedes Principle.
TECHNOLOGY: Research real-life boat designs. What size and shapes work best?
ENGINEERING: Create your boat. How could you adapt your design to make it float better or hold more weight?
MATHEMATICS: How much weight can your boat hold?