This is from the GrandParent site and needed to be shared.
Stuck on the side of the road? You'll be ready for most anything, if you've got a duffel bag-full of these must-haves from automotive experts.
Heavy-Duty Jumper Cables
Tom and Ray Magliozzi, the former hosts of NPR's top-rated show, Car Talk, put high-quality jumper cables at the top of their list. "In our humble opinion, most jumper cables stink," they say. "They're either too short, too thin, or won't stay flexible in the cold — which is when you really need them."
Experts recommend choosing cables that are at 10 to 20 feet long, 4- to 10-gauge, and made of copper.