17. Almost there!

I never move, but I deliver.
I have no voice, but I speak often.
I’m full when you visit and empty when you leave.

Alternate riddle:
Take a letter, I’m unchanged.
Take the rest and I’m still the same.

What am I?

(This was a thing I did for my brother’s birthday. My parents had me work on a scavenger hunt with them, and they wanted one of the clue locations online so I decided to put it up on my website.)