I bought this blue lid to replace the one that cracked on my Simply Store container, and it fits my 6-cup and 7-cup round dishes exactly as described. The seal is snug, so leftovers stay fresh and I haven't had leaks when carrying soup to work. It's just a lid, so don't expect anything fancy, but the plastic feels thick enough for everyday use. Only downside is that it's hand wash only in my experience, so it takes a bit more care than the glass. Model 7203 matched my old lid perfectly.