The round plug matches in the middle of the inside on the lid to seal it, the square stopper matches inside the straw hole, after which you can the straw topper retains it capped if you're not sipping. Clever! Your just lately viewed merchandise and featured recommendations › Look at https://height-adjustable-office75184.jts-blog.com/31146670/the-ultimate-guide-to-countertop-accessories-bathroom