I keep this mug in my van for a convenient cuppa every morning! It's just the right size for a cup of coffee from the Aeropress or a strong little cup of tea. I've hooked it to my daypack for a sunrise, mountain top drink too! It's super thick so my coffee doesn't get cold before I'm done. The carabiner is pretty good about stiffly staying out while in my hand too. I actually like that I can hold it in both hands without burning myself the best, though.
I recommend this product
My go-to van mug