Esbit Stainless Steel Double Walled Thermal Mug - Black, 0.375 Litres

First time of use, the piston in the lid that is connected to the button and provides the seal fell off into my coffee and couldn't be reattached.

keep my tea hot

I've had two for a couple of years now, both in fairly constant day to day use. The lids have worked fine in both though I daren't swap them otherwise the do leak. I use them in the office to keep a coffee warm and have worked well, but for whatever reason both now are failing to keep warm like they did originally - an hour max now, and less if less than half full. Disappinting because they have meant many's a half cup of cold coffee hasn't been poured down the sink! Looking for something similar now..

After a good experience with an Esbit flask I bought this to take drinks to work. It looks great and the click button is the first I've ever had at didn't leak, so started well. Unfortunately on day 2 a leak started from the lid, and by day 4 the click clack mechanism had stuck, never to work again.Really disappointing, but it did keep the coffee hot