Disposable bags

A disposable packaging bag comprises two laminated plastic films of the same size and matched with the size of the card body. The two plastic film surfaces are provided with heat-pressed welds along the four sides of the two plastic films. The welding seams on the plastic film are correspondingly nested, and the edges of the two plastic films are closed to form a hollow bag. The utility model provides a hot-pressed weld seam on the edges of two plastic films, and the weld seam forms a pattern or a character with a closed space, so that it cannot be restored and reclosed after being opened, so that lawbreakers cannot use the open package. The method of stealing confidential information in a closed manner protects the vital interests of enterprises and consumers.