It's "Bags, Aerial Gear, Mk.II", ZA.0437, I think, and the 1940 VAOS says "for use with various wireless sets". This was made of webbing, and replaced the Mk.I (specified for W.S.1 stations 1A & 1B) which was made of "No.2 tent duck with special fastener and web carrying strap".
I suspect the Mk.1 wore out very quickly in service.
Chris.
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