Is there an inventory?
Is there an inventory where I can see the items I have picked up/bought during my journey, that I haven't used and are still carrying around?
Solution 1:
That, would be a useful feature, but alas no.
You can view weapons and upgrades at a weapon upgrade bench, and you can view armor parts at an armor station.
There is no inventory that displays everything or even just quest items. It's very annoying in that respect.