Bag, method, and machine for producing a foam-in-bag dunnage material

Bag for producing a foam-in-bag dunnage material, comprising, in a non-sealed state of the bag, three straight closed side edges and, in the non-sealed state of the bag, one straight and completely open side edge, the closed and open side edges delimiting an inner bag volume, wherein a bag structure of the bag, in the non-sealed state of the bag, comprises a mixing chamber which is adapted to receive foam precursor substances, which is arranged within the inner bag volume, which is at least partially and initially delimited against the remainder of the inner bag volume, the remainder of the inner bag volume, in the non-sealed state of the bag, being formed by one cohesive chamber, wherein the mixing chamber is at least partially and initially delimited against the remainder of the inner bag volume by means of a weld seal connecting two side walls of the bag to each other, the mixing chamber as well as the remainder in the non-sealed state of the bag both being open by both being connected to the one open side edge to allow to introduce the liquid chemical foam precursor substances through the open edge portion into the mixing chamber, wherein in said non-sealed state of the bag, the bag does not comprise any portion of the inner bag volume other than the mixing chamber and the remainder of the inner bag volume.