I ordered the Vincita Big Nash rack bag yesterday.
https://vincita.cc/products/big-nash...Xktto3HizxO84e

Key Features:

• Fits a standard size (16") laptop, has a cushioned sleeve for it.
• Includes quick release hardware
• Includes shoulder strap
• Has smallish fold-down panniers (hopefully won't have heel strike issues with them, but in a pinch, I could pedal with my heels)
• High quality

My only question or bit of buyer's remorse is that I bought black, to match my front bag. I kinda like the green, but then it'll look stupid on other color bikes.

I've been hankering for it for months. Finally dug deep and bought it, reasoning that if I end up not using it enough on this bike, I can buy more KlikFix hardware and mount it on other bikes.

I have a cheap Amazon trunk bag that moves around between other bikes, but it's just not at all realistic or convenient to have to re-strap it every time. It needs a latch-in, quick-release-type mount.

Get ready for some epic shopping trip photos in the near future!