Noticeable differences--check the review.
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Purely from a durability standpoint, the store brand cup is great for transporting around a party at night. From a build perspective, we love that Solo has a squared bottom and hand grips on the side. Kirkland's cup is shorter and wider, with a circular base. We believe you will be more spill-prone with the Kirkland cup. If you are buying for beer pong, the Kirkland cup will likely topple more easily, so consider your competitors' skill levels when making your purchasing decision. Both cups hold 18 fluid ounces.
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