Let Me Overthink About It Mug
Hrmmm... let's overthink about it. Always.
Our enamelware camping mugs are made from a thick enamel-coated steel. They are heavy (for enamelware mugs-- still lighter than ceramic), smooth, wonderful to drink from, and crazy sturdy. You can abuse the heck out of them.
These are steel under enamel. So please don't use them in the microwave unless you want to create a localized lightning storm in your kitchen and pretend you're Harry Potter. Or Voldemort. They are dishwasher safe and won't fade... though keep in mind that metal does rust, so any chips in the enamel will allow the steel underneath to rust if you put it in the dishwasher. But in general... dishwashing should be fine.