To provide a package provided with an opening/closing cover sheet with a simple structure, in which the cover sheet can be kept open after it has been picked up on using.

An enclosing bag 1 made of a flexible sheet is provided with a flexible opening/closing cover sheet 14 coating the discharge opening 12. A pressure-sensitive adhesive 15 is applied on the face of cover sheet 14, contacting the enclosing bag body to repeatedly stick thereto or separated therefrom. The opening/closing cover sheet is made of a laminate film composed of a firm film layer and a flexible film layer. A notch S crossing the opening/ closing direction of the cover sheet 14 and extending to the whole length of the position 17 where the cover sheet stops peeling and further, reaching nearly the whole depth of the firm film layer, is formed in the firm film layer.