Otto Koning Coffee Cup Travel Mug 350ML, Insulated Coffee Cup with Leakproof Lid, Reusable Coffee Cups for Travel, Stainless Steel Coffee Mug for Hot and Cold Coffee Water and Tea (Pink 350ml/12oz)

Brilliant little mug! This is my go to mug now for nearly all of my hot drinks. So this was designed not to keep drinks boiling hot for 6-7 hours nor is it completely leak proof. If you want that then you need to buy a vacume flask. TBH, none of these styles of flask are totally leakproof. What it does do is keep drinks hotter/warmer for longer than a normal cup which is the whole point. Personally, I can't drink boiling hot coffee, 60 ish degrees is where I like my drinks to be. I would say that it is about 99.9% leakproof but I wouldn't toss it into my backpack. I did a test of shaking it up and down with hot water in and non came out but i still wouldn't trust it in my bag. I have hovever had no problems putting it in the side pocket of my rucksack where it stays uprightish and going on a long walk in the country or jumping on and off trains to and from work. The reason I went for this flask is that I don't sip my drinks from the hole in the lid but instead prefer to sip from the flask. It has a thick, comfortable rim unlike others which are hard and sharp. I have even started making my tea in it when working from home as it often gets cold when I get destracted by work and then I have to go and microvave it. In this I simply just pop the lid on without screwing it down which keeps my tea hot till the last drop. It has a nice rubber base and is comfortable to grip. It is also the right size for a medium takeaway coffee if you feel like splashing the cash at a cost a lottta or a starbar! There may be better thermal mugs out there but for the price, this one for me is perfect :)

My kid insists on making me tea in the morning, but gets up 2h before me! This keeps my tea hot until I'm ready to drink it.It doesn't leak at all & dishwasher cleans very quickly. Nice snap close lid which also snaps into place to stay open. Very good quality for price.

Bought for my student Granddaughter to take to school with her and she is very happy with it. It keeps her tea warm till break time. She is very happy with the look too. So all good.

It does work but only keeps the liquid warm for 2 hours max. Shams but you get what you pay for. Also, not totally leak proof if you fill it to the bottom of the screw in but it's something to learn. You only make that mistake once! Worth the £6 paid but if not on a discount, I am not sure if I would have been happy. It's also not dishwasher proof in any part.... again, not a calamity but it's a shame nonetheless.

This seems a good, sturdy mug. It definitely keeps my copious coffees hot, and is a nice size. Doesn't leak.

Not used yet but looks good.

I am loving it. Keep every hot liquid I put in for long

Beware that this is not 100% leakproof. Very good at keeping drinks hot, but leaks between top of cup and lid.