OK -- been mulling this one over a while...
First, I think its a great idea, all the gear in one place. I'd look at adding a big pocket on the back (like a fishing vest) for bulky but light items (plastic for tarp, fleece hat,etc.)
But the important things are:
ONE you have to wear it all the time. If you are way up in the wilds alone its self-rescue for 24 -96 hours. Every time you are on the water.
TWO get a PRLB -- yes its expensive, but well worth your life and your wife's peace of mind.
thanks for listening
Teacher