The round plug matches in the middle of the inside in the lid to seal it, the square stopper matches inside the straw gap, then the straw topper keeps it capped when you are not sipping. Smart! Organize your Stanley straws with a designated straw holder. Storing your straws separately https://pepperspraykeychains80223.blogdiloz.com/31189085/the-5-second-trick-for-kandi-golf-cart-accessories