What is The Rocket?

Grind lose-leaf with the most sophisticated grinder on the market today. 
Carry your lose-leaf around in the most discrete way, on your keychain.
Fill up your vaporizer with lose-leaf without spill, right to the heating chamber.

AND Yes!  Taking off the  mouthpiece doesn't only allow you to fill up a chamber, it is also a one-hitter pipe, for extra convenience on-the-go.