I have a small flask - about the volume of a cup of coffee - made by Kinto. It can deliver those surprise burns hours after filling. It’s almost too good, and has been relegated to long road trips or post-surf coffee where I know it’ll be >3 hours before I want to drink it.
A large vacuum bottle with ice cubes on a hot summers day is hard to beat too.
A large vacuum bottle with ice cubes on a hot summers day is hard to beat too.