2 Pack 40 oz Flip Straw Lid Replacement Fit for Stanley Quencher Tumbler with Stainless Steel Straws，Leak Proof Splash Resistant Lids for Stanley Cup (RED)

These are a pain to put on my 40oz Stanley. Threw them away.

They fit great to my 40oz Stanley. I really liked the color and playing a bit with adding some contrast. The lid helped with leaks although didn’t take away the leak 100%. Overall I’m so happy with my purchase.

Used on my Stanley cup and now it’s leakproof! Color is slightly off from my cup but to be expected

Bought this set as a replacement to my daughter's cracked Stanley cup lid. Big mistake ... It does not fit properly, and the liquid will leak out when you tilt the cup. Save yourself the hassle of having to return the item. If you need to replace your Stanley lid, I recommend you buy a Stanley lid.

Relieved that it fits my Osaka 40 oz tumbler, however it’s hard to twist tightly on, and leaves a bit of a space as you can see. However it DOES NOT leak at all! YAY!! Love that I can flip it up and down to drink easy and carry it around with me and not risk it leaking. My toddler can easily flip it open to drink from it too. I love the clear part of the lid so I can see how much water I have left.Would give 5 ⭐️- but I deducted points for the space between the cup and the lid and the fact that it sweats, which I know is normal and expected but still 🫠. Oh! And because it’s so hard to twist shut although the lid has a grippy silicone rubber texture on the rim so it’s easy to twist off but twisting on requires some elbow grease that I can’t be bothered with 💅. Honestly wish I could have given it a 4.5.