Thats it of course "Chestnut Paling" - split chestnut sapplings orginally, apparently as the war porogressed there was a shortage of chestnut saplings as with everything else.
I'm sure I have seen a picture of this [with the wire (snow fence)] used as a road surface over the sand - showing a light utility leaving the beaches on D+?.
On the "other" forum the picture is higher resolution and I'm sure that the "hessian" is interleaved with wire mesh.
The uses for this load are probably many - throw it in a hole, make a trak for wheeled vehicles, as Sapper says "reload" an AVRE or light a fire for a brew up
Noel