Storage box and semi-finished product of second rectangular plate body thereof

A storage box comprising

• a first rectangular plate body, including two first long sides and two first short sides, wherein one of the two first long sides and the two first short sides form a first joint member;
• a second rectangular plate body, including two second long sides and two second short sides, wherein the two second long sides and one of the two second short sides form a second joint member, and a total length of the second joint member is equal to a total length of the first joint member;
• and
• a joint module, including a first joint element and a second joint element, wherein the first joint element is disposed on the first joint member;
• the second joint element is disposed on the second joint member;
• the first joint member and the second joint member are joined through connection of the first joint element and the second joint element to make the first rectangular plate body and the second rectangular plate body to form an accommodating space after being joined;
• wherein the first rectangular plate body and the second rectangular plate body are fabric materials;
• wherein the joint module is a zipper, the first joint element is a first zipper strip, and the second joint element is a second zipper strip.