I bought this lid because I thought a 30 oz. lid would fit ALL 30 oz. cups. But the cup I had was from Wal-Mart. I found out they are NOT all the same size. It did not fit my cup at all, neither did the big orange handle. So I bought a cup from Yeti, cuz I love the Tahoe Blue color & the orange handle w/blue cup would be good together (Warrior colors-sort of) The lid I bought from Thermik is good, but I think I will buy the straw top lid from from Yeti. I have had too many spills in the car with this one, as I use a straw for drinking Diet Pepsi, ice tea, & lemon aide about 90% of the time. Plus, it is clear so I can easily see inside & I like the way the straw hole is perfectly fitted to the staw & you get both the lid & straw together. (if you made lids to fit the Wal-Mart/Target cups, I think you would sell out of them!)