Measure the height of the cabinet with a measuring tape. Purchase a hamper net that's large enough to fit inside the cabinet while leaving 6 inches of free space on top for easy access.
Use a pencil to make a mark on the inside of each corner in the cabinet, at the height of the hamper net.
Press the sharpened tip of a screw-in wall hook against one of the pencil marks. Push the tip in while rotating the hook clockwise until the hook is embedded in the wood.
Install a screw-in wall hook in each corner.
Hang the hamper net from the hooks.