Disclosed is an article of manufacture including bag having a front surface; a rear surface; two side surfaces each having a gusset therein and connecting the front and rear surfaces; a flattenable bottom surface formed by connecting the front, rear, and side surfaces; and a top surface formable by connecting the front, rear, and side surfaces. The bag has a height, a width, and a depth, and defines an internal volume. The bag is sealable and has a seal strength of at least about 1,600 pounds per square inch. The bag is formed from a plastic laminate having a thickness of from about 130 to about 200 microns and a tensile strength of at least about 3,400 pounds per square inch. The article of manufacture also includes at least about 15 pounds of a particulate, flowable composition contained therein. The bag can also have a closure system comprising a non-reusable closure and a reusable closure. Also included are methods, using the article of manufacture, of enhancing palatability of an oxidizable, particulate, flowable composition contained therein.