My favorite cup! Keeps things cold
931122
My favorite cup!  Keeps things cold.  I lost my prior one and was happy to be able to replace through Amazon.
2981116
I take this cup to the gym everyday and refill it throughout the day.  It keep my water cold for hours with no condensation.  My only wish is for one with a larger capacity.  32oz would get me through a full workout.
3893119
Great cup.  Doesnt keep ice for 24 hours as advertised, but does a decent job.  Keeps hot coffee for many hours, which is awesome.  I got it primarily for water consumption bcz I don't have to refill so often and my water stays cold for long periods.  The only thing I would like better is if the lid actually screwed on.  It fits well, but isn't 100% secure if knocked over.
1795062
This was a replacement for an older Trudeau travel cup that I had owned forever.  However, this cup is so effective at keeping liquids hot, I basically had to re-learn how to use it!  I used to be able to brew tea in my old cup and expect to be able to drink it within half an hour because it would cool down.  Not so with this cup!  I've left it in a freezing car for over an hour, and the liquid is still like molten lava.  With this cup, I make my tea, leave the lid off, and let it sit on the counter while I get ready to go.  This keeps liquids hot for HOURS!  It has great capacity and still fits in the cup holder of the car.
4271776
Love my cup! I needed something that would keep my water cold all day! This is the perfect cup for that! I will definitely order another one!
4432465
This cup is great! Ive actually filled it with ice and water, then accidentally left it in my car on a few 80-90 degree days for 12-14 hours and it has still had ice in it or been cold. Im impressed!
1801114
I absolutely love these cups.  They don't last forever, mainly because I have dropped them but they really keep your drink cold.  I have ordered many.
4852008
My new favorite travel cup.  This does an excellent job insulating.  I've had smoothies or iced tea stay very cold, for 4+ hours in over 100 degree car.  I feel comfortable leaving it my car, no matter what the temp and expecting it to still be cold when I come back.  No problems cleaning it, hand was it and use the brush for the straw that came with it.  It is not spill proof, the only downfall, but love it all the same
4913468
These are the only cups my kids use. They keep water cold in 90+ degree Florida summers and withstand all the kid abuse you can imagine. They almost never spill or leak (only if intentionally shaken while open). The carrying handle sets it apart from other brands/models. No idea why they are removing them from newer Funtainers. This one still hs the handle, thank goodness!
3807832
OMG! Best cup EVER! I plan to give one to everyone I care about. I fill it with ice water when I go to bed and it still has ice in it until the morning. Also it doesn't not condensate on the outside, so no more need for a coaster. I just set it right on my nice wood bedside table and enjoy ice cold water all night!
429958
Love my KeepCup! I ordered this yellow because it was a perfect match to the yellow on my cute new car :) This cup IS spill proof (I've tested it several times, both on purpose and on accident. LOL) The cup does sweat when you leave a cold drink with ice in it for long amounts of time, but it just makes me drink my iced coffee faster (not a bad thing). Lid is super easy to take apart to clean. Lightweight cup, easy to throw in a bag for later. Will buy more!
638996
Love, love love this tumbler cup. Been using it for a few weeks everyday and had no issues. Keeps my drinks cold for as long as I am drinking it (drinks never stay in the cup long enough to know when it warms up). I haven't put hot drinks in it yet as it mostly functions as my water bottle at work. The lid comes off and goes so super easily which is what I needed at my first plastic tumbler was a POS, recycled it as soon as this one came. BUY IT!
1195808
This is my 2nd Coldest water cup, My 1st was the insulated version. I use that for work in a very hot warehouse. The ICE stays around most of the day and keeps me cool. This new cup is not any different, it performs just as well. I've told the guys at work how well they function and stay COLD.
4929998
This cup is amazing! It keeps my drink cold all day! It's amazing that I still have ice by the end of the day!!!!!! I love the texture too, it's not slippery like the plain metal ones.
4355959
I'm on my third year with this cup and can say its the best cup I've owned. It keeps beverages warm on snowshoe/winter climbing trips and cool on kayak/ backpack trips. I use my gear hard but take care of it and have never had a problem with leakage or damage to the insulating sleeve. I'm writing this review because I'm on Amazon to buy one for my wife.
4566677
Seriously love this cup, I can fill it with as much as cold coffee as I want + ice + creamer every morning and not have to worry about it overflowing. Then I rinse it out and use it to sip water all day long at work. Its cute, its simple, its easy to hold.. it surprisingly fit in my car cup holder. Im really happy I went with this cup over all the others :)
2561692
I drink over 1.5 gallons of water a day and even in the winter it has to be super cold, theres not such thing as too cold so I love insulated cups.  Ive owned them all, YETI, RTIC PELICAN and OZARK and OZARK is by far the best of the four.  Not only does it keep ice longer; it comes in several different colors and the price is great (especially @ Wal-Mart: 9.99 for stainless or powder coated).  I bought the Navy and it is true many and I am seriously considering the purple sparkle because I love the color; I wish the lids matched the colors of the cups and would willing pay more for the feature.  I purchased several of these in different colors for Christmas gifts and everyone loved them,

Once I bought these I filled them all up with ice and while they all had some ice the next day the OZARK had the most and the ice remained in it longer than it did the others.  The one thing that would make this a perfect cup would be a spill proof lid, which is available here for the stainless tumbler and but I ordered it from eBay for much less.  They sell what is called a generic lid that supposedly fits all, but I am very skeptical since I tried to use the spill proof lid that was on my PELICAN and it does not fit.  Another consideration, while all the cups hold 30oz there is a difference in the shape and the height of the PELICAN 30 oz.  tumbler is8 9/11 of the lid adds another 1 at the lowest side 2 at the highest making it difficult to get out of the cup holder in my vehicle; even when I move the seat all the way back I still have to maneuver the cup to get it out so I do not recommend it for travel.