My brother makes these: https://odyn.studio
I've got a few of them here in Italy, but he makes them in Cardiff. I also use a KeepCup when I'm heading out and about.
They're lovely but all sold out :(
Ah balls, sorry, I thought he might have produced some more. Perhaps with lockdown he's been unable to get to the studio.
@Tenderloin started
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My brother makes these: https://odyn.studio
I've got a few of them here in Italy, but he makes them in Cardiff. I also use a KeepCup when I'm heading out and about.