[neilv]

> a normal insulated bottle

Anyone who hasn't already experienced a good vacuum-insulated water bottle, you're in for a treat.

Warning: Normally, when you pour hot coffee or tea into a mug, it cools significantly within a minute. But put it in an insulated bottle for the first time, and it might surprise burn your tongue half an hour later. (Or maybe I was the only one who didn't anticipate this.)

[godelski]

  > might surprise burn your tongue half an hour later.

A *good* vacuum-insulated bottle should be able to do this 90 minutes later. I have some non expensive ones that will keep my tea hot for over 10hrs. Not warm, I mean hot. Even a cheap $10 thermos brand thermos will do at least 6 hrs. They even frequently have cups as caps. I'm sensitive to heat and always need 5 minutes after pouring it into the cup, hours after making my tea.

We're so good at keeping liquids hot it's crazy. If you can't either drink your liquid in 10 hrs or get to a microwave within that time, you're looking for a pretty niche product and a self heating bottle isn't it.

[jamiedumont]

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.

[bryanlarsen]

If you want to burn your tongue many hours later, prewarm the bottle by filling with boiling water before filling with your coffee.

[hooverd]

I swear my Zojirushi travel mug defies the laws of physics.