If you find that you need more lava rocks for your kit, you've come to the right place.
The lava rocks help disperse the flames and make a huge difference in radiating and retaining heat. As a matter of fact, it makes such a difference that we never use our Zutto without them.
For first use, we like to dump the lava rocks into an open fire pit with no Zutto installed and shake the fire pit to drain the dust. If your lava rocks were exposed to moisture, make sure you dry them off slowly with a low flame before cranking it up.
Optional: canvas bag
Roughly 2kg, or 4.5lbs