[SketchySeaBeast]

It'd need to be able to pull you out somehow - the danger here is being entrapped and squeezed in the grain, not a fall.

[mikey_p]

Actually falling is an issue with bridged grain. Even among people who will get in bins, it's widely accepted that you never go into flowing grain.

[Seattle3503]

I assume weight is a part of what entraps someone. What if you used bungee cords to reduce your weight? Or had a rip cord you could pull that would yank you out.