LET'S DRINK TO THIS. You have a half dozen sippy cups (never enough) and a half million regular cups (way too many). But get yourself a SNUG and you'll have 5,6 sippy cups! That's because SNUG silicone sippy lids fit over any regular cup with a 2.5"--3.75" diameter and instantly prevent that cup from spewing its contents when knocked over or tossed off a high chair (not that that's ever happened). Hooray for cleanliness.