Rectangular wide mouth, rigid high-density polyethylene. Made in USA.Squeeze more of these space-saving bottles into your backpack or cooler Carry more solids, powders or liquids on your next trip Innovative rectangular and square shapes...store or stack them in places where other bottles won't fit Great for mixing pancake batter or baby formula, reconstituting juice concentrates and powdered mixes, scrambling eggs, etc. Convenient wide mouth allows easy filling and pouring of contents Heavy-duty, won't puncture or split under rough conditions Dimensions: 3 3/16 in. x 6 in. x 9 3/4 in.