“there ones that you can close and open and that’s a good one.”

74% of 19 verified owners recommend the Stanley Quencher H2.0 FlowState 40 oz, based on real owner verdicts aggregated from Reddit, enthusiast forums, and YouTube.
Affiliate blogs here say 50% recommend, while the owner-based score is 74%. They earn a commission on every sale — so we show them for transparency but never let them move the score.
The headline score reflects owners (Reddit, enthusiast forums), independent lab tests, blogs with no affiliate links, and YouTube owner-comments when they line up with owners. YouTube and Affiliate blogs are shown for perspective but kept out here — hover the i for why.
Synthesized from what Stanley Quencher H2.0 FlowState 40 oz owners say — not a spec sheet.
Retailers' own star averages, for comparison — separate from our vetted owner-verdict score above.
“there ones that you can close and open and that’s a good one.”
“This Shows the consumer vote is really not about function just fashion”
“If you don’t clean it then mold will appear.”
“I bought an $8 attachment on Amazon, and now mine won't leak.”
“personally I have 4 so I love them”
“Stanley is litterly gonna spill because it has a open straw”
“the Stanley does not claim to be watertight”
“The [Stanley](https://www.stanley1913.com/products/adventure-quencher-travel-tumbler-40-oz?utm_source=foursixty&utm_medium=content&utm_campaign=website%20shoppable%20social) 40oz is god tier. It’s big enough so I can share with my DH, it keeps things cold, and it does fit in the cup holder.”
“not getting why anyone would want a Stanley cup”
“Stanley’s lid doesn’t even come off easily lol”
“I love the Stanley flip straw tumbler which is leak proof”
“I personally don’t like Stanley’s”
“Now I have an original Stanley, and it's incredibly durable!”
“it makes the same point. The straw sticking out the top makes it incredibly inpractical”
“I was gifted my first Stanley, which was a 40oz, and I thought it was *perfect* for at home use but a bit impractical and heavy for class/desks and just traveling with me for daily errands and outings.”
“I am returning my tumbler because I just bought it yesterday and I was hoping it not to leak but sadly it leaks even when it is not upside down”
“a 40oz Quencher I take to theory sometimes, but it doesn’t seem to keep water cold any better than the Meoky tumbler I got for $20 on Amazon.”
“Wow, I bought a cup. Thanks for the video on how to use it”
“Not buying until this quencher is 100% leak proof when the lid is closed!”
“Unfortunately it isn't leakproof. Stanley's competitors have come out with similar cups that are in fact leakproof, so this is somewhat disappointing.”
“I got it off their site when they restocked and I really like it. It fits in my cup holder and I love, love the handle.”
“I like tumblers for casual use cause they fit in my cup holder and are easier for frequent sipping”
“its so convenient and ergonomic”
“The twisting part of my lid is so hard to twist I feel like I’m almost breaking it”