- It seems to be a totally rigid rectangular prism, so it's probably pretty aggressively structured. Normally bags would sag or deform somewhere, this looks more like a video equipment case, which probably wouldn't be normal in the setting
- Looks like it has a flip-top with a protective lip to keep rain out. Sort of like "what if LowePro made the Mystery Ranch Kletterwerks Flip"
- It's pretty big. If it's full of spy-gear, that would be heavy, and it would make for an awkward load if it doesn't conform to the wearer at all
- Why is the back compartment that shape
- What's up with that side strap? Given the placement, the fact that the bag is clearly internally rigid, and that there's only one strap, it can't for compression. There's no pocket below it so it wouldn't be for securing long objects.
I presume someone will respond to this post by linking to a real backpack that everyone actually wore in 60's Berlin lol



