How to stop the leakage from the design?

Question

I have the design attached. it is like a water cap design. I want to rotate the lid clockwise to seal the circle container. However, I noticed that when I shake the container, water leaks. Note, the lid rotates from the inside of the container, unlike most water bottles.
How can I guarantee sealing it with no leakage? should make the lid rotate from the outside? or is there a quick fix to my design?

DKNguyen · Answer

I think you might have tunnel vision after spending so much time designing the container. The solution is quite obvious, simple, and fast.
When the cap is female, you have a soft, deformable pad at the base inside the cap.
When the cap is male, as it is in your case, a gasket or O-ring is what is used.

How to stop the leakage from the design?

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