They fill me up and you empty me, almost everyday; if you raise my arm, I work the opposite way. What am I?

Answer: A mailbox.

More Classic Riddles with answers

More Classic Riddles

This thing devours all things. All man, all beasts, all flowers and trees. Even the fiery sun, and the shadowy moon, will one day be devoured by this thing. Stone it grinds, metal it bites. And it shall make wood rot. Is it powerful? Well it is rather not, but it kills powerful things a lot. Its immortal yet it is not some type of god. What is it?
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face. What is it?
Three-fourths of a cross, and a circle complete, An upright where two semicircles meet, A rectangle triangle standing on feet, Two semicircles, and a circle complete. What is it?
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed. What am I?
Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?
Two words, my answer is only two words. To keep me, you must give me. What am I?
Untainted, Eternal, Marooned A place where the living will move. A shrine beneath the sun. Greeted by the morning's crest. Our sanctity, Our rest. For when our day is done. What am I?
Until I am measured I am not known, Yet how you miss me when I have flown. What Am I?
Up and down,up and down, touching neither sky nor ground. What is it?
Used to threaten, used to defeat. Sometimes it grows, sometimes it shrinks. Used to conquer, used to protect. It marks your downfall, it marks your success. The true god of war, the creator of mess. What is it?
We capture light, and yet we don't. We reflect rays of sun, and yet we don't. Without us all the world is gray and dull for everyone. What are we?
What 5 letter word typed in all capital letters can be read the same upside down?