In the video, a man is seen demonstrating how to secure a cooler lid. He begins by placing the lid on the cooler and then proceeds to tie a string around the lid. The man ties the string in a knot, ensuring that the lid is securely fastened to the cooler. He then pulls on the string to show how tightly it is secured. The man's actions are deliberate and precise, indicating that he is experienced in this task. The video provides a clear and concise demonstration of how to secure a cooler lid using a string.