In-plane organizer for your carry-on that you love?

I currently use a large open mouthed bag that goes under my seat, and a roll-aboard in the overhead bin. I check a bag also, so while it wouldn't all fit in my under-seat bag, the main reason I need the roller bag is because I can't carry a bag around the airport due to my back and neck issues. Especially with my computer in there. So I put the non-wheeled bag over the handle of the roll-aboard when I'm moving around.

I want to try modifying that strategy and get it down to a single one (roll-aboard or backpack with wheels) which goes in the overhead bin, but with a large "pouch" I would remove and keep at my seat. The pouch would have noise canceling headphones, phone, tablet, charger, kleenex, etc. I usually have a small pillow and blanket but I can pull those out separately.

Any suggestions for a nice organizer pouch for this purpose?