I think I would recommend attaching the straw to the lid for ease
595539
The bottles work really well and wash well in the top shelf of the dishwasher.  For a design 2.0, I think I would recommend attaching the straw to the lid for ease.  I would recommend purchase to others.
4779702
This is an excellent alternative to unscrewing a lid and pouring manually (especially if pouring into a water bottle), but it still needs to be thought out more.  As soon as the container gets near the half-way point, the pressure drops and I have to tilt the container to put more pressure on the spigot.  If the container's lid were shifted up/down to the edge of the container instead of the exact center, I would probably give both products 5 stars.
1293258
These cups serve their purpose very well IF the covers are pressed in properly.  You have to be careful because it's not too easy to achieve the "burp" seal - you have to press tightly and work your way around the perimeter, then visually check to make sure that all areas are completely puashed down.  Otherwise, if not done correctly the covers will pop off if dropped...I made that mistake on the first use.

I really like the design of the straw seal, and the product colors, and the robust feel.  The plastic is tough and durable and doesn't stain, and stands up well to daily dishwasher cleaning.  They work with any kind of cheap straw, which makes this the preferred "everyday" cup for the kids.  It's a good, basic design.

 The seem terribly expensive, which kind of nags at me whenever I think about it, but I don't mind as much when I think about all of the garbage kids' cups that we've gone through that fade, wear, break, or leak.
3201377
The only thing about this container that may give you fits (although minimal) is trying to attach the lid to the container once it arrives. It's just one of those fiddly, irritating tasks that can have you cursing like a sailor in a matter of seconds. But once you calm yourself and get it attached, you'll find yourself wondering why you never made this purchase before that day. It is easy to use, making for a hands-free execution with the step-on lid opener. And it doesn't create annoyance by slamming shut, thanks to the innovative slow-closure mechanism. It looks sharp and sits neatly in a corner of the room. Odors are not an issue with the overlapping lid. And because of the lip at the top of the receptacle, the bag stays neatly in place. If you want trash to be that last thing on your mind, I can easily recommend this as a great addition to your kitchen.
2312245
In general, the size and ease of carrying this bottle is great.  As mentioned in some other reviews that I read before buying this product, you do get a work-out of your cheek muscles but that is not necessarily a negative. I do find that when the cap is removed to refill the bottle, the straw falls out very easily which I don't like.  Having had it happen a few times, I am now mindful of it and grab it so it won't fall on the ground as it did the first few times.
1755184
It's a nice drinking vessel, but you MUST take the lid off, if you don't want to use the straw, so kind of inconvenient. It's doesn't leak when the straw is out.
4671691
I'm a big fan of drinking water stored in glass containers, the taste of clean filtered water is what everyone should experience on a daily basis anywhere at anytime. This container is very portable, relatively light considering it volume, and well made. The lid (when not cross threaded) seals very tightly without leaks, as other buyers have stated the lid does have a tendency to cross thread but if you tighten it with enough force you will know its on right because the lid will cinch down and make a squeak as the silicone seal presses against the glass rim or it will "pop" into the right thread track thereby revealing it wasn't properly threaded, either way the lid isn't as big an issue as some would be led to believe from reading negative reviews. ****I would like if the silicone sleeve were less "holy" making it even more protected because if it were to fall on one of the spots where the silicone is absent I believe it will surely shatter. Seeing as it is glass it will probably break someday until then I will be drinking from the best vessel to store my pure filtered water.
582374
The stainless steel thermos is of quality and helps in keeping the food or water hot for several hours.  The only complaint is the inner plastic part of the lid peeled off from from the stainless part after the use of 1 years.  But I guess this could be fixed easily by a good glue.
3717575
Update - I no longer use this cap.  I have been diligent about washing the straw lid with the munchkin brushes but it was just too much and I gave up on this lid.  No matter what I did, my water would taste funky so I passed this up and went back to the original lid for now.  I wish the rubber lip piece would come apart for thorough washing like my son's sippy cups.

I use the straw lid with my Lifeline bottle without any issues.  I wash the bottle and straw lid daily after reading reviews about mold.  I use the munchkin cleaning brushes and make sure to go though the straw part to prevent mold.  I also try to let it air dry at night so it can dry thoroughly.

http://smile.amazon.com/Munchkin-Cleaning-Brush-Set/dp/B0077M41Z4/ref=sr_1_2?ie=UTF8&qid=1427815551&sr=8-2&keywords=straw+cleaner
1941441
great, great and great. what more is there to say?

ummm. The straws have a nice little knurl on where the straw sits at the opening in the lid to help keep it from freely moving. nice little touch.
597646
When I bought my 64oz hydro flask I knew I wanted something that wouldn't require me to unscrew the lid and then have to screw it back on, found this sip lid and has been good, pop the lid and get a drink, then pop it back down. Sometimes though the ice inside will block the hole. Good addition to your flask
2786351
I was thrilled this fits the top of my 24oz and 12 oz wide/short cup and the 16oz tumbler too.  You know it's a good seal because the top burps like a Tupperware container.  I dumped my cup upside down and it leaked out the straw hole (with another brand of reusable straw in it), but the top stayed on even with vigorous shaking.  So don't expect it to be a miracle sippy cup replacement, but for preventing disastrous spills, it should do the trick.  I like the rubbery feel of it and the way it holds the straw nicely without any plastic clacking noise (I stick a metal straw in the top of my Tervis sippy top, usually, for my endless drives around town taking my kids place, and it's not quite as sealed or silent as I'd like it to be).
Anyway, two thumbs up, thanks for a nifty product, GreenPaxx!
2557839
Love the straw with rubber surrounding the straw holder. Doesn't slip off. The other lid didn't have this and now the straw falls of it. I would recommend this one!
110493
I have really liked having this glass water bottle...it is light easy to carry and is a good size
however my straw does not stay connected to the top lid...I
2035522
Good Idea that it attaches to the bottom of the cover- I don't know why yet, but I guess its just cool.  Beware though, I forgot what my friend Archimedes told me and filled this mug all the way up to the top with boiling water.  Guess what happened?  Since the object placed in water displaces the same volume- this attachment did exactly that.  So me holding the cup with my hand and this attachment displacing boiling water out which in turn ran down the side of the mug onto my hand scolded it slightly.  So here is the game you will need to play: How much water needs to be in the mug to immerse the Infuser but not more then that to be pushed out of the mug. Have fun.
3446233
Let me start by saying I do recommend this product. The concept is great and it is easy to drink out of.  Those having troubles getting liquid out are probably over tightening the top and perhaps didn't pinch the top of the silicone stopper as they say to do before first use.

The improvements I would add would be a larger opening since ice cubes don't fit and it looks a bit like a baby bottle, and a ring/finger hole to hold it with like the Nalgene sippy cup has (previously my favorite sippy).

My kids love it and it seems quite safe and sturdy.
1064207
I've been saying that a certain company needed to come out with a lid like this for months because being able to close the lid with kids is amazing. My husband has actually stolen this lid from me and has taken it to work. He loves it. It fits nicely on to an 20 oz Yeti cup (and probably and similar companies). I would recommend every few day taking the black part off to wash with warm water and soap because if not mold will build up. I found out that the hard way and that's why I'm giving it only 4 stars.

Disclaimer: I received this product for free or discounted for my honest and unbiased opinion. I only review items that I've tried and would recommend.