Abstract: An envelope can be used as a photo stand in a stable manner. It is made up of a frame panel having a window, a retaining panel that forms, in cooperation with the frame panel, a photo-receiving portion in the shape of a bag, and a leg-forming panel connecting with the photo-receiving portion and having a sealing flap on one side thereof. The sealing flap is formed with two cut lines that extend longitudinally over the entire length of the sealing flap to define an unsealing strip therebetween. The leg-forming panel has supporting legs defined by discontinuous cuts. The photo-receiving portion is formed with slits adapted to engage the legs along its bottom edge.