Abstract: A portfolio includes a body having a receiving space therein, a backside of the body having at least one sliding groove, an upper cover being a foldable sheet for sealing the receiving space; and a connecting unit passing through the sliding groove of the body and the upper cover so that the upper cover is slidable along the body. The connecting unit is a T rod and a washer; the T rod passes through a through hole of the upper cover and the sliding groove of the body, an enlarged end of the T rod resists against an upper side of the through hole; a size of the enlarged end of the T rod is greater than the size of the through hole and the sliding groove so that the T rod is retained upon the rear surface; and another end of the T rod is engaged with a washer.

Abstract: A portfolio comprises a body having a receiving space therein, a backside of the body having at least one sliding groove; an upper cover being a foldable sheet for sealing the receiving space; and a connecting unit passing through the sliding groove of the body and the upper cover so that the upper cover is slidable along the body. The connecting unit is a T rod and a washer; the T rod passes through a through hole of the upper cover and the sliding groove of the body, an enlarged end of the T rod resists against an upper side of the through hole; a size of the enlarged end of the T rod is greater than the size of the through hole and the sliding groove so that the T rod is retained upon the rear surface; and another end of the T rod is engaged with a washer.

Abstract: An expandable document bag comprises a boxing casing; the box casing having a lower plate; a left lateral plate and a right lateral plate; an interior of the box casing being formed with a receiving space; each of the left lateral plate and right lateral plate having an inserting post; the lower plate being elastic; and the lower plate having two sliding slots at positions corresponding to the two inserting posts, each sliding slot being capable of receiving a respective inserting post; the inserting posts being slidable within the sliding slots. The lower plate is elastic and thus is expandable so as to adjust a size of the receiving space. The box casing is installed with at least one receiving bag for receiving documents or other objects.