You upgrade the Disruptor backpack by unlocking its production at Rustfield Scrapyard in Delysia, then crafting it through the dispatch/production system. The backpack itself is equipped in the special equipment slot, and one source says the unlock comes from a research/production unlock tied to that scrapyard, while another notes the Disruptor can also be obtained through the same region after progressing the relevant area content.

What to do

  1. Progress far enough in the main story to open the relevant Delysia area content.
  1. Unlock or clear Rustfield Scrapyard so the Disruptor production option becomes available.
  1. Run the production/dispatch mission to craft a new Disruptor backpack.
  1. Equip it in the special equipment slot once it’s finished.

Notes

  • One guide says the unlock is tied to a research step that increases machine-enemy component drops and then enables Disruptor production at Rustfield Scrapyard.
  • A community post says the blueprint/upgrade path may require story progress into chapter 10 and the Gorthak region being pacified first, though that same thread mixes in some player speculation.
  • Another video walkthrough describes an alternative route where the backpack can be found or taken from enemies in the area, but the cleaner and more repeatable method is crafting it after unlocking the scrapyard production line.

Quick Scoop

If your goal is the upgrade path , think of it as: advance story → unlock Rustfield Scrapyard → complete the Disruptor production mission → equip the crafted backpack.

Bottom line

The safest answer is that the Disruptor backpack is not upgraded like a normal item; it is unlocked/crafted through Rustfield Scrapyard production after the right story progress , then equipped from special gear.