Here's a pic of the DJ Marschgepäck chaps:
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It is also described in
Bekleidung u. Ausrüstung der HJ 1934 p114.
A "DJ-Marschgepäck" is noted in RJF Verordnungsblatt III/46 dated 19.12.1935 as having been exclusively trialled in that year by
Gebiet 24 Mecklenburg. The order is entitled "Schulranzen" and states that Mecklenburg was the only Gebiet permitted to use it and that manufactureres were not authorised to sell the DJ Marschgepäck to any units outside of Mecklenburg. Thinking logically, this order can't be talking about the version pictured above because that clearly existed prior to 1935 and the fact that it is shown there means that it had already been authorised.
"Schulranzen" is a word now used to describe the stiff, box-like backpacks worn today by schoolkids here in Germany so the order may well be talking about a version of the HJ-Tornister for the DJ.