It works.
I recommend a triple system.
What's in your pockets doesn't count as part of the system. They are the last ditch resources.
Vest: a civillian equivalent of a load baring harness. The next step up,
A small secondary pack: Either a day or fanny pack.
Main pack:
You ditch in the reverse order. It gives you an extra layer.
_________________________
When in danger or in doubt
run in circles scream and shout
RAH
And always remember TANSTAAFL