Getting a kid out of a 5-point carseat harness can be a problem. When you release the center buckle, the shoulder straps still form a loop over each arm. If you panic and try to pull the kid out by the arms he isn't going anywhere.

There is also the sternum buckle which are all different. It could be hard to figure out by touch inside a dark, smoky car.

I always have a knife but I'm re-thinking the need for a dedicated belt cutter. Something large and easy to hook and slash with like the Lifehammer of Gerber LMF safety knife. I'd hate to drop a ResQme inside a burning car laying on its side.

I rolled my pickup on its side when I was a teenager. My first thought after stopping was "Crud" and my second was "The windshield is broken, maybe I can bust my way out through it." Reason prevailed and I decided to use the topside door. Luckily a bystander hopped up there to hold it open.

Useful tidbit I learned is that the steering wheel makes a good foothold for climbing out.