Answer:
You can carry it everywhere you go, and it does not get heavy. What is it?
I can be found in seconds, minutes and centuries, but not in days, years or decades.
It is a popular afterlife destination where you want to send people when you're mad at them.
Two year-Βold children who throw tantrums get this nickname. So did the tsar "Ivan."
What has keys but no locks, Space but no room, You can enter but you canβt exit.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.