Great travel mug. Seal degrades over time
922636
Keeps drinks hot and has saved me from more spills than i can count.
After about 8 months of daily use i can hear the seal break every now and again while i'm sitting at my desk.  The seal is likely degrading and hot air eventually finds a way to escape.
2955392
I purchased this to take on an extended road trip, so I could make coffee at the hotel each morning and carry it with me on the road.

I don't have a problem with the plastic interior; I don't have a problem with the open sip opening.  It fits my cup holder perfectly.  From outward appearances, this is exactly what I wanted.

However, the rubber seal around the lid LEAKS.  The lid isn't a screw-type lid; instead you just push it into the mug, and it uses a rubbery "gasket" to form a seal.  The seal doesn't seal completely, so I end up with a dribble of liquid every time I try to drink from it.  I've tried everything: making sure both lid and mug are dry before inserting the lid, not filling the mug too full, etc.  Nothing seems to help it to seal completely.

  Since no one else has reported this problem, I have to assume I got a "dud."  I'll be returning this to Amazon upon my return.
4098013
Not totally sealable, and it ended up breaking pretty easy at some point. I do like Ello's camp-gear-like travel mug, though, so I'd just steer clear of this design unless you never drop things, never need something leak-proof, etc. Throwing my travel mug in my purse or bag with no worries is too important for this city-dweller.
1551446
I had a Thermos King Travel Tumbler and it worked great. It kept my coffee hot all morning but the cap mechanism was a pain to disassemble/ reassemble for cleaning and the gasket eventually gave out after a year and I tossed the tumbler with no interest in buying another one.<a data-hook="product-link-linked" class="a-link-normal" href="/Thermos-Stainless-Steel-King-16-Ounce-Travel-Tumbler-Midnight-Blue/dp/B002PY7AYS/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Thermos Stainless Steel King 16-Ounce Travel Tumbler, Midnight Blue</a>.

I bought a two pack of Contigo auto seal travel mugs to replace the Thermos.<a data-hook="product-link-linked" class="a-link-normal" href="/Contigo-Autoseal-Travel-Mug-Stainless-Steel-Vacuum-Insulated-Tumbler-2-Pack-Blue-Green/dp/B0027SB2Q4/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Contigo Autoseal Travel Mug - Stainless Steel Vacuum Insulated Tumbler - 2 Pack (Blue/Green)</a>&nbsp;They are very easy to clean and I liked the auto seal feature that keeps the mug sealed at all times unless you press a button to sip. But they are not insulated very well and my coffee would already be tepid after 2 to 3 hours. They are so poorly insulated the exterior of the mug would get very warm. So off to the thrift store with those.

I decided to give this Stanley a try. It is very easy to disassemble/reassemble for cleaning and has the same type of auto lock feature I liked about the Contigo.  I always preheat thermal containers with boiling water for at least 5 minutes before filling with coffee about 7am. With the Stanley my coffee is still hot at noon after sipping on it all morning, performing just as well as the Thermos brand mug.

The only disappointment I have with this mug is the finish. The product page picture gives the impression it will be of the classic green hammertone finish that has been on Stanley containers for years. But its not.  It is a much less interesting glossy olive drab paint with a textured finish. If you zoom in on the picture of the Navy color option it is the same finish only olive drab.
2720464
After a year of use the seal on the lid can be slightly off. Still a great product, but not leak proof. They can also be very hard to unscrew at times.
3526896
Absolutely love this mug, it keeps my drinks hot and does not leak! However my only complaint with this mug is that coffee/strong teas get caught in the vacuum seal on the inner portion of the lid and I have had to take it apart in order to clean it. I don't use a dish washer but I'm sure if you was it in the dishwasher regularly it is not a problem.
1318196
If there's one thing I can't stand, it's a travel mug that leaks or drips. No more. This mug seals well, is easy to drink from without drips, comes apart for cleaning, keeps drinks at temperature, and is just plain solid. Only minor complaint; when the lid is screwed on there's enough friction with the rubber gasket that it's a bit stubborn to open at times, but really love the mug.
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!
2016816
Thermos Stainless King 16-Ounce Leak-Proof Travel Mug, Midnight Blue

i like it .but its face  has broke when it get me
438241
I had one of these mugs that I used for years, and I adored it. I could clip it to my bag and it wouldn't leak, the lid could be operated with one hand, but didn't pop open easily, and it was the only travel mug I'd ever owned that I could drink from without dripping, sloshing, or getting too much hot coffee at once.

After years of use (including, I admit, regular runs though the dishwasher), my old one finally gave up its insulation, so I ordered this one to replace it. The mug itself is still greatkeeps the coffee relatively hot, carabiner is sturdybut the slightly-redesigned lid is terrible. It seals marginally well, but nowhere near as well as the otherI get drips and oozing around the edges, and it's occasionally popped open right after sealing. I used to give my old one a shake over the sink before heading out, just to double-check the seal; but I don't even bother with this one because it usually either makes a mess down my forearm or pops open entirely. And I never, ever use the carabiner unless the mug is empty.

Also, the lid is missing the bump on the side that held the flap out of the way while you drink. So now I have to grip the handle and stretch one fingertip up to the lid to keep the coffee-covered flap from bumping my nose while I drink. In general, I still like the way it "drinks," but the flap thing is really annoying.

Worst of all, less than a year after I purchased it, the flap on the lid has snapped off entirely, so now it's useless.

I loved my original mug so much that I'm still contemplating buying yet another one, but I'm really wary now. If it doesn't seal well enough to use the carabiner, I may as well buy another stylebut I'm not looking forward to trying to find a lid that's this nice to drink out of.
1657686
This is a simple item. Yes the lid isn't 100% leak-proof. As long as you are careful about putting it on and don't expect a travel mug to be shaken and held upside down at any length it should be fine. Yes there is a seam on the inside. It doesn't affect cleaning or use in any way. Yes you have to wash it by hand. It takes 2 seconds. Now consider that the body is stainless and there isn't any plastic in the lid, the price (which is a third of most travel mugs and they have plastic in them), and the fact that it keeps liquids nice and warm or cold when you need to and the outside isn't really affected. It's not perfect. I haven't seen a perfect travel mug....not for $6.99.
344703
After 4 years my husband is still in love with his travel mug.  He uses it daily to enjoy a cup of coffee on the way to work.  It's still in amazing shape, keeps his drink warm, and does not leak.  We have been able to clean around the rubber gasket no problem and while there is some "build up" of what my husband calls "coffee flavor" on his mug (he refuses to scrub it) - it is easily enough cleaned back to it's stainless spotless interior.

Finally this Christmas he got me one.  I've been "making due" with the other travel mugs in the house that he hated.  I have hated them all as well.  This mug is AWESOME!!!

I made myself a cup of tea and went outside to play with the kids.  My mug sat on a brick wall in 36F (2C) temperatures and after 30 min it was still almost too hot to drink.  The outside of the mug was FREEZING cold.  It was amazing that the exterior did not warm up and the beverage inside was hot after so long.  That right there is some great insulation!!

If the mug is sealed and I drive over some bumps there is no splashing or leaking.  When I open the drink port there is a small amount of liquid under the flip top, but barely enough to make a fuss over.  If you drink at an extreme angle and touch your nose to the mug you will wind up with a drop of beverage or condensation on your nose because of the way the flip seal opens.  That being the only thing I have to "watch for" when using it makes this cup 5 stars.  I have endured so many HORRIBLE mugs and this one is a dream.
1514227
I've had this mug for less than 2 years, and the rubber seal on the lid has stretched, allowing the mug to leak.  I guess this is due to the fact that I have had to remove the rubber ring to completely clean the lid.  I always have milk in my coffee, and even after regular cleaning, the lid would start to smell like spoiled milk after a few days.  I soon realized that I had to take apart the lid to fully clean it, and it seems this has shortened the life of the lid.

However, a friend who takes his coffe black has had the same mug for several years with no complaints.
3857865
Second one I've purchased of these- I loved the first one so much I bought another. The previous one I used just about everyday for 2.5-3 years before it finally started leaking. For $12 this is the best everyday commuting insulated mug!
4365347
This mug has great thermal insulating but I would advise against the "snapseal" design if you are using this mug while placing it in a back pack, motorcycle side case, etc... in general, I would not trust the lid to stay sealed. I have had the "snapseal" catch on something and open up numerous times, resulting in a mess of spilled coffee. I love the "autoseal" design from contigo and will be using them from now on.
3471205
*Update 3 stars -  After using daily for a month, the plastic cover isn't as tight anymore. The sliding cover is a little loose and doesn't seal as well. When I slide it open to sip, there's too much give and it moves just enough to cause the flow to stutter. Not a deal breaker but makes drinking out of it less convenient. The mug itself stays excellent. Problem is just with the plastic cover which doesn't look like it will last too long.

Orig review - 4 stars. Excellent mule mug! I love the weight of it and double wall insulation. No sweating and cup is never too hot to handle. I wasn't sure how well this mug would work given the plastic top, however it maintains temperature for a decent amount of time. The cap isn't leak proof - you can't toss it into a bag. However, it does seal pretty well and only trickles a tiny bit when tipped over. NIce, solid design, with a cool look for the office.
3910578
I've had one of these for many, many years. Unfortunately, I put the cover on too tightly with hot coffee in it and by the time I tried to open it, it had sealed shut. I tried pliers and the cover broke. I was so happy to find another to replace it. This is the best thermos mug as far as style, use, fitting into the cup holder in the car. I would highly recommend this cup.