Spill-Proof Silicone Accessory Set for Stanley Cups - Includes Straw Covers, Round and Square Leak Stoppers - Anti-Dust Tumbler Accessories

Works very well with a 40 ounce steel cup from Spencer stores. This cup I used also has a turn around to close part like Stanley has. I did get the straws and cup boots too. No leaks. I will say even if you don't have a Stanley cup it was worth buying the accessories. I am very happy with this product.

My daughter and I were disappointed with how much the Stanley cups leak. These nicely fit stoppers truly helps! My daughters 40oz doesn't leak at all, my 30 oz does maybe a driplet. Honestly, I'm nervous of tipping it over like my daughter does hers all willy nilly. I like the simplicity of the rubber and the top stopper seems like it can handle alot of putting and pulling off. Great product, great price.

Fits my 40 oz Stanley great. It no longer leaks. Only draw back is the small cap inside the lids constantly falls off. I don’t use it but it still doesn’t leak.

It’s perfect, it did spill a little bit but it’s pretty vacuum sealed, I was tired of my Stanley spilling in my bag, after using it today it didn’t spilled in my bag and I’m happy about it.Other stuff the middle part that everybody talks about that it falls, it’s doest falls on mine ? I do recommend it c:

Sizing was perfect and leak proof was nothing less than amazing. Durability could be a bit better but other than that there’s nothing wrong with this product. Definitely worth the money

I didn't know that a Stanley needed so many things, anyway this set is good. The round stoppers, for some reason, keep falling off, which kind of sucks. The other items fit well. They are fairly easy to clean. Install and use. Drinking from the Stanley is not affected so they work as functioned. The colour of the items is as pictured. Although the round stopper falls off the quality of all the items is pretty good.

Bought as a gift/stocking stuffer and went over very well. Everything fit nicely and worked as expected on the Stanley.

Every time when I refilled my water and drank out of it from the straw , the middle round part always came off and dropped inside my water. I don’t know why really. I thought I didn’t put it in the right way, but it happened so many times after I put it back in and it came off again. The straw part was excellent it didn’t leak at all, but that middle part is bothering me.