I got a Brightline bag on eBay for a song. Love it. It also downsizes really nicely. Holds my GATS jar, leatherman, Dave Clarks, iPad/kneeboard combo, a couple sectionals, logbook, fuel stick, calculator, space blanket, water tabs, fire starter, flashlights, batteries, collapsable water bottle, and my hood.
That's just the main section, no larger than a (man) purse. I can zip on another section if I wanted to bring a firearm or paper IAPs or something stupid like that. Now I just need me a hh radio...