[lorenzhs]

Obviously this isn't in the same league as a good functional backpack, but that's not the point, is it?

Regarding your first point, I find a waist strap much more important, but then again, with a few more hours of work, a chest strap could easily be added.

[CmdrSprinkles]

I would argue that adding the picture of "Look, it can hold 25 pounds of rocks" implies it might be. And I know that the more tech oriented communities often don't appreciate ergonomics and have a tendency to just say "Oh cool, I can stick it to the man and save money!".

And this is one of those cases where there are some huge caveats.