In the video, a person is seen holding a clear plastic bag filled with green water beads. The person is stretching the bag, causing the water beads to move around inside. The person then pours water into the bag, causing the water beads to expand and fill the bag. The person continues to stretch and manipulate the bag, showing the elasticity and transparency of the bag. The water beads are small, round, and have a shiny, translucent green color. The plastic bag appears to be made of a thin, flexible material.