SimonM
Bushcrafter (boy, I've got a lot to say!)
It's an air marker panel...basically a rectangle of hi viz orange fabric that unrolls and fastens to the bottom straps of the Bergan.What is the small rolled pouch thing above the lid fastening straps?
I started carrying it after someone asked how I would be seen if I needed help, as all my gear is subdued, earthy colours.