My Frank doesn't leak if I treat it nicely, keep it upright etc. But I found an old Tupperware cup that functions more like a thermos with screw down lid. I can chuck that thing in my backpack and trust it to remain hot and not leak for hours. So maybe narrow your search to small thermos's.
nevetsg
joined 2 years ago
I used to pirate android apps but then I realised that flicking some independent app developer $10 has no affect on my budget. And it is way easier.