Abstract: A web of preformed bags includes an exterior sheet material and an expandable slit sheet material. The exterior sheet material and an expandable slit sheet material are coupled along longitudinal seams. The expandable slit sheet material has slits arranged substantially parallel to the longitudinal seams. The web has a longitudinal fold such that the expandable slit sheet material is on the inner side of the exterior sheet material. The longitudinal fold is substantially parallel to the longitudinal seams. When the expandable slit sheet material is in an unexpanded form, the exterior sheet material extends farther away from the longitudinal seams than the expandable slit sheet material extends from the longitudinal seams. The expandable slit sheet material in each of the bags is expandable from the unexpanded form to an expanded form.

Abstract: A web of bags includes a sheet material and a connecting material. The sheet material includes two sheets that are formed from a fiber-based material, are arranged to form a series of bags, and are connected together to form sides of the bags. Each bag is bounded by the sides where sheets are connected together and an opening. The connecting material is applied to inner surfaces of the sheets and can be activated to connect inner surfaces by the activated portions of the connecting material. The connecting material is applied to closing regions on the inner surfaces of the sheets such that the connecting material in the closing regions can be activated to close the opening.