I’ve used several flight bags over the years (Mostly from LW and Strongbags, both high quality brands). At the regionals, I packed food most trips, so I needed a large-ish cooler bag. I’m now on the ER, and rarely pack food that needs to be chilled, so I downsized to the JetPack I from AeroCoast, and it’s been great so far. It has a ton of space for two iPads, clipboard, external batteries, flashlight, pens, sunshades, snacks, passport, compact umbrella, and small binoculars, but takes up a pretty small footprint. (It fits perfect next to the ER seat, even when it’s moved fully to the outside.) It’s can technically be used as a back-pack as well, but I’ve never used it that way as it works great with the LW J-Hook.