Although I never really needed a kit like this, I still find it’s a good idea to tag one along in your car. It contains everything you need for basic survival: water, food, warmth, basic tools, etc. Even if you’re not in a survival situation, it still might come in handy, considering it packs a lot in a little package.

If you never leave the city, this Field Soldering Kit might come in handy. It contains everything you need to fix up some wiring when you don’t have access to proper tools. I actually have one in my car and used it once to fix some wiring on a headlamp while camping – far from a soldering iron.

Survival Kit in an Altoids tin [link]

Field Soldering Kit [link]