Related Clues:
- Containing nothing
- Uninhabited
- Word on an airplane bathroom door
- Ready for a refill
- Totally drained
- Jackson Browne's "Running on ---"
- It's hard to run on it
- Like a bottle ready to be recycled
- Available to rent
- Having nary a drop
- Blank
- Like rooms to rent
- Like recycled bottles
- Worthless, as threats
- E, on a gas gauge