Are Stanley Cups Leak Proof?

I was so excited to try my new Stanley H2.0 Flowstate Tumbler that I bought online. I heard it was supposed to keep drinks hot or cold for hours, and I wanted to test it out. I brewed some coffee, poured it into the tumbler, put it in my backpack, and left for work.

I thought having a warm drink during my morning meeting would be nice. But when I got to the office, I realized something was wrong.

There was a wet patch on my backpack, and the smell of coffee was everywhere. I opened my backpack and saw that my Stanley Cup had spilled all over my laptop, papers, and books.

While the Stanley tumbler isn’t leakproof, which it should be for the price? During regular use, you should not have a problem with it. Plus, there are cheap splash guards you can find on Amazon that can make your Stanley Tumbler leakproof.

The new Stanley Cups are designed to resist leaks, but they are not completely leak-proof


The new H2.0 Flowstate Tumblers have some improvements over the old Adventure Quenchers. They are designed to be “spill-proof” and “splash-resistant” — but they can still leak a little.

There is a silicone cover on the straw hole that stops water from splashing out when you move or drive. It also reduces the amount of water that comes out of the straw hole if you tip over your Stanley.

But that doesn’t mean you can put your Stanley Cup in a bag or hang it on your shoulder — unless you don’t mind getting wet.

The Adventure Quenchers Is Not Leak Proof

The Adventure Quenchers, the original Stanley Cups, were very popular and sold out everywhere in the country. But they also had a big problem: they leaked a lot.

If you see any bad reviews online about Stanley Cups leaking when you use them normally, they are probably about the old Adventure Quencher, not the new Flowstate Tumbler.

The issue with the Adventure Quencher was that the lids had straw holes that were just that.

Nothing to stop water from coming out. And coming out quickly.

This meant that if you walked fast with a full Adventure Quencher, water would splash out of your lid. Or if you dropped your Adventure Quencher, water would spill out fast until you picked it up.

But don’t worry, if you still have an Adventure Quencher, you can replace the lid with most other Stanley Cup lids — including the H2.0 Flowstate lids from Stanley.