The video shows a person using a marker to draw on a purple bag. The person starts by drawing a triangle, then proceeds to draw several more triangles around it. The person continues to draw more triangles, filling the entire bag with them. The video is shot in a close-up shot, focusing on the person's hand and the bag. The person's hand is steady, and the triangles are evenly spaced and sized. The purple bag has a zipper on the top, and the marker used is black.