Answer:
What do you fill with empty hands?
My sides are firmly laced about, Yet nothing is withinΝΎ You'll think my head is strange indeed, Being nothing else but skin.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.