Bottle leaks no matter how tight you screw on the cap
936182
Wanted to love this bottle because it has no plastic. Unfortunately it leaks and ruined my leather purse and almost destroyed my iphone.
1406360
Such a great idea, but it leaks through the dispenser in the top. If I want to use it, I have to carry the entire walk and make sure the bottle doesn't tip. Poor design, but great idea.
3867094
These water bottles leak.  When you squeeze them at all, water comes pouring our of where the lid screws on getting water everywhere.
2124946
Mine leaked through the twist top almost from the time I got it. It's sometimes a hassle to unscrew the cap. I like other models where you can just push a button to drink. It's an ok water bottle if you make sure it's always right side up.
2364416
While the stainless steel portion of the bottle is of nice quality, and the bottle is of the height I wanted (8 inches to fit in a lunch sack), our family is completely dissatisfied with the lid because it really does leak! I've studied the bottle carefully: it only has one wide thread to screw the lid to, making it very difficult to get the lid on straight; and, even when you think you've got it screwed on correctly, it tends to unscrew itself ever so slightly as the bottle bounces around in a backpack, and then, no matter how careful you were screwing the lid on to begin with, it starts to leak!  Also the silicon gasket doesn't want to stay seated, so if you are not meticulous about re-seating the gasket every time you've removed the lid, you get rapid leakage if the bottle tips at all. The flip top also does not back off the mouth piece adequately (there is an interference with the handle), so the flip top tends to hit your nose when you try to drink from the bottle; the mouth piece is oval, so you can't really just turn the bottle sideways to avoid your nose.  This bottle was a huge disappointment to me.
2299893
I was excited when I saw them but they leaked terribly and were difficult to open after being placed on.  each cap in the container leaked.  It recommended it with Aquafina bottles and I took them into the grocery store to make sure they matched.  Bummer.
598762
The cap does not seem to seat down far enough into the bottle to make a solid seal. It would leak when turned upside down and shaken. Not reliable enough.
1324030
My issue with this bottle is the spout cap. When I read the product description before placing my order I thought the cap snapping into the handle seemed like a great and convenient feature but it turns out to be more difficult than convenient. It does not snap in easy. You have to press pretty hard to get it to snap into place and it is extra difficult when you do not have a surface to lean the bottle on. I thought about just not securing the cap on the handle but then the cap hangs in the way of your face.  I don't think I need to go through this much effort just to simply take a sip of water.
2280322
It leaks and no matter how how much I tighten it the leak dies not go away.
2549501
This cap sadly doesn't work. I tried it on three different occasions and the water just POURS out. It's so frustrating. It screws on just fine but the little clear flap doesn't keep the water from pouring out when you are trying to flip the container. I recently bought a different model cap from a  different brand called  "easy load" fingers crossed this other brand works.
929492
The concept of the product is great, it just doesn't fit the wide mouth Nalgene bottle as well as advertised. I found the cap a little hard to tighten down all the way on the bottle and when I finally did, it leaked on me. The leak came from the interface of the bottle and cap and not the drinking cap. Maybe there is something wrong with the threading, but it isn't great to have a half shot of water go down the front of you every time you take a drink.
4667745
While I was attracted to the price and functionality of this water bottle, it leaks like crazy when you squeeze it.  The rubber seal is poorly made-  it is very flimsy, so you can overtighten it easily. And if you undertighten, it leaks all over.  Avoid.
4821149
They leak! The caps don't seal so the bottle leaks if not upright! How us that good? It's the same with the 1/2 ounce size as well!
3009293
Would give zero stars if I could. Large opening cap slowly leaked water overnight and soaked our RV carpeting, ruining some wood dining room trim. Leaked out one third of the container. It was set on the floor in the upright position when I used the handle. After finding it leaking, I set it in the pouring position and drew water from it. When I let go of the spigot, it did not close all the way and continued to drip out.
4756405
The bottle that I received has a defect, when the lid is closed if it tips at all, the rubber seal inside the cap does not actually stop water from flowing out of the bottle. In fact the cap literally fills with water so you'll get a big splash when you turn it up.

Edit: my bottle was replaced by the company and the replacement met my expectations.
11746
I might not be screwing it correctly, or it might not be for my 3 gallon water bottle but it is not sealing properly. I tried to test the valve by itself and it seems that is leaking too. Not with the same intensity but I suppose it is because of the water pressure. I hope it is not my fault for not doing something right, but it didn't work for me.
3085784
The seal on this cap leaks and it drives me crazy. My friend bought the no name brand one and has no problems. Don't spend your money on this one.