OK, I'm a bit confused. Is it your intent to don/attach the gear only when crossing a body of water (each bridge, for instance)... or to wear/attach it all the time? I can't particularly argue with your specified load-out, but conceptually I have a hard time conceiving ever loading myself down like this.

I'm going to trust a glass breaker/seat belt cutter, and take my chances on the remainder. My fear is to get my emergency gear on my person somehow "hung up" preventing my safe extraction. That happened to me in a rafting situation (emergency kit in waist pack hung up) so I'm never going to load myself beyond what fits in pants pockets.