The round plug fits in the middle of the inside with the lid to seal it, the square stopper matches inside the straw gap, after which the straw topper keeps it capped when you are not sipping. Clever! When furnishing a small bathroom or powder room, seek out multipurpose pieces https://penaiaa245psb1.ageeksblog.com/31061783/5-tips-about-4x4-accessories-near-me-you-can-use-today