US Patent 9238544 Article and method for sealing a collapsible container

Articles and related methods are provided, the articles including a collapsible container having a flexible wall and enclosing material to be dispensed, a cap secured to one end of the container, the cap including an outlet, an inner collar at least partially surrounding the end of the container, and an outer collar at least partially surrounding the inner collar, and a gap provided between the inner collar and the outer collar, the gap having a size sufficient to receive a folded section of the flexible wall as the container collapses and the material is dispensed through the outlet.