Sure I will jump in here...
Ok this is just me, skills are lighter then gear. Just cause its 8 hours without a break, the GHB (I think of this as something different from a Bug-Out Bag) doesn't need to be a 72 hour kit (unless it does). So lets start with a few questions;
1. How do you see your GHB?
2. What is in the GHB?
3. Do you EDC?
Now that said, I recommend a Backpack as it lets you keep your hands free. You could easily be fine with what you have so, why the switch?
Ok this is just me, skills are lighter then gear. Just cause its 8 hours without a break, the GHB (I think of this as something different from a Bug-Out Bag) doesn't need to be a 72 hour kit (unless it does). So lets start with a few questions;
1. How do you see your GHB?
2. What is in the GHB?
3. Do you EDC?
Now that said, I recommend a Backpack as it lets you keep your hands free. You could easily be fine with what you have so, why the switch?