Went to valuhardware in east aurora and bought a tube of 70lb sand for about $4. Fits right in the back and does not take up much space. I have been driving for the past couple of weeks with 18" blizzaks all around and it really makes a difference on the roads around here (I mainly drive around clarence, akron, lockport, east aurora, west seneca, orchard park areas) as the pot holes are pretty common place.