Daniel,
When I first looked at the pictures of the bag it reminded me of the configuration of the carrying straps on the Supply Unit No. 4 for the WS22.
I had some free time and decided to do some research to see if I could prove a WS22 connection.
I found reference to ZA 14044 on page 53 of this document:
http://www.vmarsmanuals.co.uk/archiv...structions.pdf
The nomenclature is different in that ZA 14044 is referred to as "Covers Immersion, No 2" there are also 2 notes: "Only issued with early sets" and "Only issued when specially authorized"
I hope this helps,
Colin