Very good waterbottle, but after heavy use the seal on ...
933533
Very good waterbottle, but after heavy use the seal on top gave way and started to leak. Other than that it was a good waterbottle.
2686343
Very good but subject to internal corrosion. Keep it lubricated.
899430
Excellent water bottle.  It is as promised, and doesn't seem to build up a weird smell like plastic ones I've had in the past.  The one negative is that when I opened it for the first time, the little rubber seal at the top came out, and I couldn't figure out where it went.  It's not attached, and just relies on the size of the cap to keep in in place.
2259804
It's been nearly two months since I purchased my regular mouth jar sealer, but I just started using it regularly within the past couple of weeks. I primarily bought it to vacuum seal the mason jars that I store my juiced fruits and veggies, nut milks and homemade salad dressings in.  It has served me well in that function.

However, the other night I juiced about twelve 8 oz jars and three 1 qt jars worth of juice. After sealing maybe the third jar the blue seal fell from the inside of the apparatus. Though the seal was quite easy to re-install on the jar sealer, it kept falling out practically every time I used it thereafter. As you can imagine, this became very annoying fairly quickly.

Something else that I'd like to note is that I have to use two mason jar lids stacked atop one another to get a good seal. Attempts to get a good seal using one lid fail every time. Nevertheless, I would likely purchase this item again, unless of course I found a more quality item that served the same purpose.
2041087
Good, durable waterbottle. The fact that you can't  leave it open is the only downside, but you should already know that when buying
1578286
I have had this bottle for 6 months and have really appreciated how tightly it sealed when closed as well as how hot it kept the coffee. There is one disappointing feature which is, a rubber stopper that fits inside the lid that creates the wonderful seal I spoke of. Unfortunately, several weeks ago, this started to  loosen. I have been very careful but unfortunately, it is now gone. It must have fallen off while washing (unbeknownst to me) and no doubt has been ground to bits in the garbage disposal. I am unable to find a place to simply replace the stopper so, I will need to replace the cup as coffee leaks out all over without the stopper.
If this feature could be improved the cup would be an easy 5 stars.
3386513
Worked really well for me when I first opened it, and is holding well for the repairs I used it on about six months ago. However, I went to use this the other day, and it was completely dried out despite being sealed tightly.
2843782
Had this item for two years now. It's worked very good thus far. I just had to throw one of the cups away as the seal broke and started leaking. You need to watch how much you fill the container because it will leak through the top. Most recently I've been using it to make bulletproof coffee. I don't think it was designed to work with hot beverages, perhaps that's why the seal broke.
1988501
I love this bottle and it really helps keep me hydrated, but it has unfortunately started to leak. I'm not sure where the leak is coming from [and therefore I'm unsure which part I'd need to replace], but water is definitely getting out. Not a whole lot at a time, but enough to be annoying and make me not want to keep it in my backpack with any electronics or important papers/notebooks - it ruined a magazine before I noticed the leak. Kind of disappointing that it started leaking after only a few months [especially since it's a Camelbak], but it's still usable. Before it started leaking, I would've given this bottle 5 stars without hesitation. It really is great.
3676053
I liked this water bottle very much.  It retains temperature for more than 12 hours.  The ice water I put in it before going bed is still cold in the morning.

I gave three stars because of some quirks of this bottle.  It is not easy to screw the top well, and can cause frequent leaks.  Also, the sucking water out through the spout is difficult because vacuum develop inside.  Then I have to unscrew the lid to let air in.

I misplace this bottle recently, and my reorder is the Contigo Autoseal to avoid the vacuum issue.
4358505
I bought four of these, and within a week two were leaking. (The other two lasted about two years without leaking.) The seal in the lid doesn't seem to stay in very well.

Other than that it's great: really durable, looks like new even after a year.
2830256
When I first received this water bottle, I loved it!  It is reusable, doesn't pick up odors, and has a cool sleeve that makes it easy to hold onto and protects the glass.  The way the lid seals (rubber seal pressing on glass) seems perfect.  It doesn't begin to leak after repeated use like a plastic cap that wears a little every time you remove and replace it.  It has a very satisfying "pop" when you open the lid.  So satisfying that my friends (who I gave these to as gifts as well) made a little video of them popping open their bottles to the tune of Jingle Bells.

First issue arose when the clear little O-Ring that provides springiness for opening the bottle broke.  I tried to replace it with an O-Ring from a hardware store, but the new one smelled chemical-y.  So, no more lid springing open. I still used the water bottle daily.

Next issue was when I the rubbery sleeve started getting loose and twisty.  I can straighten it and redistribute it so it looks okay, but it's not long  before it gets crooked again.  But I still use the water bottle daily.

Last issue is with some discoloration on the rubber seal.  After regular use for 8 months or so, I began to notice a faint rust-colored ring on the rubber seal where it presses on the glass.  It doesn't seem to cause any issues, but I can't scrub it off and it looks unappealing.  Still, I use the water bottle daily!
1691382
Very good! I use it everyday! It is my to-go water bottle! I had it for about a year or so. The only downside is the cap. Because I don't wash the mouth that often, there are a lot of black specks there (some gunk) and it stains the clear rubber part of the water bottle that touches the mouth.
2440941
This water proofer did the job and beaded off the water from my hiking boots, but the bottle was leaking when I received it.  It leaked again in my backpack, so now I have very little left, but the inside of my backpack is waterproofed!  Not really want I wanted...wouldn't probably buy it again, unless they change containers.
3036658
These mugs are awesome.  This was a second purchase for me, because the finish on the first was compromised after putting it in the dish washer (the clear coat on the stainless came off in sections).  Unfortunately, after about a month's use, this one developed a deformed seal on the flip lid from hot beverages and is no longer leak proof.  I had to mix and match parts to get one good mug.  My fault on the finish, but not the seal on the flip lid - both lids have seen the same exact beverages repeatedly.
1535215
Updated January 25, 2014:
I have had this for about 4 months now and left this in the car for about 6 hours on a cold 0 degree night while skiing.  It had nothing in it at the time.  The next day when I went to shake the canister to mix my coffee and sugar the coffee came leaking out lid (the larger lid, not the drinking spout).  The seal in the lid appears to have grown, or maybe was over-sized from the start, so the seal comes out of the groove in the lid in one spot and makes it leak.  I'm not sure if the exposure to the cold temperatures caused this.  I can still use it by pushing the seal back in, and it seals fine then, but now I have to check it every time I take the lid off.

The strap also completely pulled apart.  I could have overlooked this, because it's nylon so I can use a flame to seal the edges back up and sew it back on, but the fact that I now have to check the seal and re-seat it almost every time kind of ruins it.

I gave it two stars since it worked well for a few months.  I suppose I could try to find another seal to fix the lid, but I'm not sure it's worth the time and effort.

Original Review:
I bought this primarily for coffee.  I've had it about 3 or 4 weeks now and my coffee is still warm about 4 hours later even if I frequently leave the drinking spout open.

It seals really well.  I put my coffee in with a little bit of sugar and then shake the whole thing up.

The strap had one rather large thread pulling out when I got it, but I cut it down a few times and it seems to have stopped pulling.  The strap stayed together so I'm not really concerned.

The cap isn't the most convenient thing to clean.  It has some small areas that are hard to get a sponge or bottle brush, but overall this isn't a big deal.

I'd probably buy another one of these if I needed it.
1304727
I like the bottle, its nice and light with a great seal on the top.  The only issue with it is that if you drop it once, it will dent.  I'm pretty active and have a waterbottle on me at all times, so mine is pretty dented and doesn't look as good as it did new.