Canadian transmission bag ?

[Ed Storey]

It was probably either an official or unofficial substitution from the supply system. To the average person working in QM, a web bag is a web bag and generally only informed end-users and enthusiasts know the difference so it may have been an unofficial substitution when the kit was surplused.

On the other hand, there may have been a shortage of the actual WS58 web Satchels and the Haversack could have been deemed an acceptable alternative to the WS58 specific bag.