I'm still thinking. Which one is the one you built egg? BTW, you're doing this one too.
1. First line - needs to be always with. Either belt mounted or built for a cargo pocket on pants. The new 5.11 stuff got me thinking. I'm thinking like a bail out of a vehicle under fire kind of thing. Not long term survival. An hour or two or whatever time it takes for the calvary to arrive. If its belt mounted, it needs to go on the rigger belt and horizontal.
2. Size dictated by the above.
3. Needs to hold a Pocket or WETSU-sized kit. A signal mirror (a real one).
4. Med stuff to treat maybe two GSW? No IVs.
What else?