I've somehow landed a post retirement gig at a design firm and my new commute/work environs might push me into carrying my commuting gear a little differently. Thoughtful suggestions welcome.

The photo below shows a pretty accurate representation of what I'll be taking to the office daily. I won't be using panniers because a couple of the bikes I commute on don't have racks.



Notes: The papers I carry need to be kept in good shape and dry; which would mean well separated from my lunch and somewhat protected from being bent and folded.

I have a Chrome Metropolis that will work OK for this. Anything out there that might work better?