Capable little water bottle
595868
This is a great water bottle for my teenaged daughter to bring to school.  Obviously it sweats, but the straw delivery system is pretty efficient in the event of tip-overs. The mouthpiece and straw can both be easily detatched and cleaned, and after-market replacements are readily available on Amazon or your local big box.
1765900
Bought this as an add-on item and was a little worried because it was so cheap, but it's proven to be a great little bottle for the price. Plastic is not super hard, and I haven't had any problems with it leaking.
1037944
It is a water bottle so rest assured it does a water bottle's job. The straw is sturdy, the mouth-piece is relatively easy to clean and the material appears to have longevity.
1608186
I love this water bottle it's small enough that I can take it to the gym and still big enough to hold water to drink the whole day!
1921998
Great bottle, not too big that it won't fit in vehicle cupholders, but small enough that it fits in my bike's bottle holder as well
3519242
Durable water bottle and it's portable because it's not big and heavy, when filled with water, like a 5-gallon bottle.
541814
I like that it is small to take up minimal counter space, yet it holds enough water to floss thoroughly.
2645467
I have had this bottle for a little over three weeks now, and have used it between 4-5 times every week so far. There are four parts to this water bottle--the bottle itself, the cap, the internal diffuser, and the lid to the diffuser. Overall, it seems sturdy, but I haven't tried to wash it in the dishwasher yet, and have only attempted hand washing it. It has become my most used water bottle and is easy to clean if you're washing by hand. One thing I dislike is that I often carry the water bottle by the plastic loop, but the underside of this is very sharp plastic and can cut into your fingers, even though the description itself advertises, "The lid also features a small handle so that the bottle can be carried with just a couple of fingers or can be hooked on to a backpack." The manufacturers should look into shaving down the hard edge on the handle.
2824301
great little bottle to have when you need to get oil or something else into a really small space
3841991
Love the fact that it's the size of "normal" bottle of water!  The gripper is nice, makes it comfortable to hold.  I much prefer to drink out of glass as compared to plastic.  The top seems to stay on nicely.  It just feels a little on the thin side, so I'm a little concerned about how long it's going to last.  But so far so good!  The thinness does make it nice and light to carry though.  Also, it came with a weird little cover/holder, not sure I would ever use that.
2583119
I purchased this bottle because I was finding it diffficult to remember to drink enough water throughout the day. I would drink a large glass or a 16oz bottle a day which is far from what I should be drinking, so I was looking for the biggest bottle I could find. Now I carry it around with me wherever I go, which has definitely gotten me to drink more. The bottle seems to be made well and works as advertised. I don't feel the icy middle really gets the water much cooler,  but that's not a deal breaker for me.
345969
I have to admit I've been on a search for a simple, easy-to-clean, easy to use on-the-go water bottle. Some of the ones that were easiest to drink out of while driving or spill-proof while traveling, were difficult to clean. Others had straws that slurped and didn't flow well. Some were very wide or had twist-off caps that were awkward while driving.

The Zak! HydraTrak insulated tumbler isn't perfect. For instance, I wouldn't throw it in my tote bag with books and my tablet, but it does have a lot of nice features.

1. It's very simple to open, and simple to clean.
2. The straw is easy to drink out of while driving and quiet when in public places. No noisy slurping.
3. It doesn't leave a condensation puddle around it on my desk, or dripping off the bottom onto my dress clothes when I'm in the car.
4. It fits nicely into my car's cup holders, though it doesn't fit into my stroller's unbelievably-narrow cup holders (which really translates to only fitting disposable water bottles.)
5. It does stay cold for a long time. Not for hours and hours, but more than long enough to drink the water at a leisurely pace if I'm busy.
6. The silicone bands make an easy way to track my water intake (which I'm terrible about) by sliding them up to the top of the tumbler.
7. I like the look of it. It's sleek, colorful, and stylish.
8. It's comfortable in my hand, a nice size for holding and drinking out of. The silicone bands also help with traction so it doesn't slip in my hand.
9. 20 ounces is a good size for a water bottle. I like it better than the 16 ounce size I've had before.

There are a few cons. Just a few.
1. It isn't completely spill-proof. The straw feature makes it somewhat tip-safe in a vehicle. If you remove the straw and close the little plastic spout it's even more tip-safe. But if you drop it, I'm sure that white gasket-lid can slip out of place and spill. I also wouldn't toss it into a tote bag with other items.
2. The bottom silicone band tends to shift up or down when pulling it in and out of my cup holder. (Not a big deal at all.)
3. I have yet to convince my kids that they can't share this water bottle with me, since I'm tracking my water with it. They're starting to understand they can't share it with me, but they don't really understand why. They just think I'm being selfish.
4. There isn't a handle or strap I can just slip my finger through when my hands are full. I really need to save a hand to carry it.
5. I'm worried the straw will wear out before the rest of it. I hope I can find replacements.

I've been using the HydraTrak tumbler at home, in the car, and at the county fair. It has been working really well for me, and I'll be looking for replacement straws to have on hand. I like it so much, I even went back for it when I left it sitting on a table at the fair. I was relieved to see it still there.

I see that Zak! Designs has a HydraTrak tumbler with a lever lid instead of a straw. I think I'd like that one even better than the straw version.
28885
spout angled so that you can water plants that are otherwise out of reach.  small capacity, but this is as advertised
1538962
I have been using this water bottle for a while and I like the design, style and functionality.  It allows me to place fruit, vegetables, or herbs like fresh mint into the water to infuse some flavors to my drinking water.  I can easily drink or pour without them coming out.  I have found it nice to have the handle on it.  It makes it nice to carry.  Especially when you have many other bags or items to carry with it.  It has been easy to use while exercising too.  The handle being material makes it a bit awkward while cleaning it, but it dries quickly.  I like that it is covered but you still have a "window" to your water and it's contents.
2752887
small and easy to carry, nice one and small enough
3540479
A slim, smart water bottle holder is harder to find than you might think.  I needed an extra one for guests who go hiking with us when visiting.  This one is a bit better than the one I already own because the bottle enters at a angle, making it easier to access and return to the holder.  There's nothing special about the bottle itself, and the nozzle opens and closes adequately.  What I like best is that you don't get a huge fanny pack plus bottle holder, just enough space to hold minimal stuff (car key, credit card...)and a slim profile.
1135790
I've only had a chance to use it a couple of times. It's enough water for a couple of hours at most. I can stuff a 27.5 tube, a small tool kit, some gels, wallet,iPhone 6, and car keys. It's small, light, but it fits secure it a nice change to my POC vdp pack which sometimes feels very cumbersome on shorter rides.