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..thanks for your feedback as well!
Been looking around a bit more, and found some mugs that are very nice apparently -
it's double-walled titanium ones:..though have seen that exact model (without handle, but with proper lid) on amazon only, and now it seems to be out of stock (at least in this size (200ml) with that lid).
Anybody used products from that brand before? I've never heard of them..
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My girlfriend has a spork by them...
I have a Snowpeak mug similar to that one https://snowpeak.com/products/ti-double-h450-stacking-mug-tw-122?variant=671161265 and it looks like you can buy plastic lids for them too. I'm always a little worried about putting it in a bag in case it gets dented but that is probably me just being precious.
I have one - great for around the house/walk to work etc, and does a good job of keeping coffee warmer than a normal cup would. As its aluminium it's very sturdy and gets lots of complements for looking cool. My main gripe is that they don't have some form of closure over the drinking hole a la Keep Cup etc because as CYOA says, it can slosh if you're in a rush. I've been thinking about how I could try and get something 3D printed to do the job, because then it would be pretty ideal.