Over-the-toilet storage rack

This type of shelf is typically waterproof and rustproof, making it suitable for a humid bathroom environment. 

It often has a grid design to prevent water from pooling and to reduce dust buildup. 

The rack provides a space-saving solution for organizing toiletries, soap, and other bath supplies. 

Some versions are designed to be placed directly on the toilet tank without the need for drilling or punching holes, and may include adhesive stickers for stability.