In my situation I found that carrying lots of gear on me anytime away from home was a non-starter for many of the reasons mentioned here. The backpack became what you'd take on a weekend hike -- way too much for EDC. Now I'm down to pocket carry for EDC.
Experience has taught me what I need to have on me when I'm away from home. Experience has also taught me that the first aid kit I have on me is more than what I need, hence why I will build one to fulfill my needs.
Given that experience is my teacher, I would like to know if experience has taught you that you need everything in the backpack you mentioned. If not, how heavy of a bag would you carry if you only carried what you required in the past?
Jeanette Isabelle