Mystery bag help

[cmp truck]

Kevin,
I have one of these in jungle green dated 1963. It has 37 Pattern fittings (brass) and the "L" strap attachments are like 37 Pattern.
However, I do not know of any radio that fits in a bag like this.
I saw a 31 set on Epay that had a bag such as this, and I tried putting my 31 set into my bag and it doesn't really work when you try to put all the CES into the bag.
This bag does not fit the British idea of a radio bag or frame which allows the radio operator to have the controls readily available. I am not referring to vehicular radios or small sets like the PRC-349, rather sets carried by a radio operator. Also, the Brits had a habit of liking their manpacks to be self standing (vertical) when in use.
The loop on the end of the webbing strap is slightly odd.
I have no idea what it is, however, it could be "radio equipment" related or designed for a totally other purpose.
Ian
VA6SSV