We have talked about this subject in the past. I carry a 10lb extinguisher in the trunk of my car. After using less than 1/4 of the content to extinguish a van fire and paying a good sum of money to have it replaced (tank was older than 12 years) I also started carrying a smaller disposable extinguisher. I will use that one first, provided the fire is small enough, rather than using a portion of the larger one on a small fire and having to pay to get it refilled.