Good candidates
Seasonal clothing and spare linens often match the shape.
Avoid overpacking
A bin that cannot slide out easily will not be used.
Control dust
Closed containers can protect contents and prevent loose items spreading.
Keep essentials elsewhere
Daily and important items should not require moving a bed to reach.
Practical boundary. Measure first, respect product load limits, and do not improvise wall, ceiling or overhead installations when the structure or appropriate hardware is uncertain.