The round plug matches in the middle of the inside on the lid to seal it, the square stopper matches inside the straw hole, and afterwards the straw topper retains it capped if you're not sipping. Smart! Manage your Stanley straws with a specified straw holder. Storing your straws individually https://devincbvly.dgbloggers.com/32345434/the-smart-trick-of-sourdough-accessories-that-no-one-is-discussing