One of the latest ongoing discoveries from Oetzi was his survival belt. First it was in an ergonomic load bearing pattern to support his leggings that again was thought a more recent innovation.
inside the simple folded over pocket were some needles, firemaking kit, some lithic microtools.
What you are porbably looking at is a form of moneybelt with either such a fold over compartment with end opening or a zippered compartment such as a money belt.
I owned such a belt from the now collectable S.D. Meyer company (now El Paso Saddlery.)
Aside from paper documents and money you pretty much are restricted to small needles, thread, x-acto blades or razors, a BCB wire saw and perahps a booklet of paper matches.
You MUST have a belt loop model, and the thicker the better, both for space and comfort. A thin belt cuts like a knife under high impact into soft tissue vs the greater safety of a wide belt.
You might also consider discretely sharpening the belt buckle on the inner face like a chisel.
The germans actually produced two shot belt buckles in small pistol calibers, but I don't think that would work vs charging bears.