Retractable enclosure zipper and double-layer retractable enclosure zipper

A retractable enclosure zipper, comprising:

• a first zipper cloth, a second zipper cloth, a retractable cloth, and a support structure;
• wherein the first zipper cloth is arranged with first zipper teeth, and the second zipper cloth is arranged with second zipper teeth;
• an end of the retractable cloth is connected to the first zipper cloth, and another end of the retractable cloth is connected to the second zipper cloth;
• the support structure is disposed close to the first zipper teeth and is disposed on an inner side of the retractable cloth;
• the support structure comprises a supporting cloth and a support member;
• the supporting cloth and the retractable cloth enclose to define a receiving space, and the support member is disposed in the receiving space;
• a width of the support member is greater than or equal to a width of a combination of the first zipper teeth and the second zipper teeth when engaged, for supporting the first zipper teeth, the second zipper teeth, and the retractable cloth.