A lid for container that can be open manually but closes itself automatically, The lid can he made out of plastic, paper or metal but preferably it should be made out of plastic. Along the lid lateral side, there is an item attached firmly on the lid and acting like a spring. This spring features an extension on the end not connected to the lid that acts as a button. Additionally, for usage, the lid is manually equipped with a flexible moving piece of material that can be made out of various material but preferably out of paper. This flexible piece of material will have a cut on one end that will be used to insert the button through in such a way that after insertion, the spring, the button, and the moving tongue move simultaneously. In order to use the assembly, the user needs to exert a pressure on the button with a finger, so that the spring gets under pressure and the moving piece of material moves along the surface of the lid to reveal the opening. As soon as the pressure on the button is removed, the spring gets back to its resting position along with the moving piece of material that covers the opening once again.