A folder includes a first enclosure member, a second enclosure member, a stretchable and retractable connecting member, and a support member. The first enclosure member and the second enclosure member are arranged opposite to each other and form an accommodating space, and the accommodating space is used for receiving files. The stretchable and retractable connecting member is connected between the first enclosure member and the second enclosure member, and a size of the accommodating space changes with stretching and retracting of the stretchable and retractable connecting member. The support member is detachably connected between the first enclosure member and the second enclosure member, and the support member is used for limiting the accommodating space to a predetermined size.

A folder includes a first enclosure member, a second enclosure member, a stretchable and retractable connecting member, and a support member. The first enclosure member and the second enclosure member are arranged opposite to each other and form an accommodating space, and the accommodating space is used for receiving files. The stretchable and retractable connecting member is connected between the first enclosure member and the second enclosure member, and a size of the accommodating space changes with stretching and retracting of the stretchable and retractable connecting member. The support member is detachably connected between the first enclosure member and the second enclosure member, and the support member is used for limiting the accommodating space to a predetermined size.