Hand made heat resistant glass cup with hande 400ml amber

I use it on a heated coaster to keep my drink warm. The bottom of this cup is completely flat, so it heats up very efficiently. The only drawback is that it can't be used in the microwave, so I have to heat the drink in a mug first and then transfer it to this cup, which takes a bit of time. It would be really helpful if you could make it microwave-compatible, even if it costs a bit more.

It's not the original way to use it, but it's a good idea. I use it as a small beer mug. It holds a decent amount and is easy to hold, so I like it.