[pp material]: strong and durable, environmentally friendly pp, will not cause harm to health.[pulley]: there are pulleys at the bottom, which is more labor-saving when moving the box.[addable]: it can be superimposed arbitrarily, and there is a groove on the cover, which will not be displaced.[large capacity]: you can store clothes and quilts of different sizes.[seal buckle]: sealed buckles on both sides, good sealing, effective against insects and moisture.