Great question, this is something that I've been pondering for a little while now. I've been doing a fair bit of stage editing in the last few months and have been considering a 1510LFC pelican case not just for safe carry, but just as a "home" for all my mobile gear as well. I'm pretty sure it'll all fit.
What I currently tow along (in two backpacks) is my ...
I very rarely do this, but once very very early in my career I actually brought my entire studio to the other side of the country, lock stock and barrel (except the mixing console. Even I have my limits...), and built an ADR-studio in an apartment. That simply will not happen again though.
Nowadays, I see it like this (at least for now); if I really must do ...
I'm not sure what your budget it, but assuming its limited, I can definitely recommend the Fostex FR2-le. The preamps are actually great for the cost of the unit and it is certainly a lightweight piece of kit.
Very light. I think it comes in at under 1kg.
Decent preamps (we're obviously not talking SD quality, but they are far better than the price ...
Beyond the basics that everyone else seems to carry:
My own headphones
My own mouse/input device and any drivers needed
Backup of any drives
2 spare 32GB thumb drives
Small rolls of as many kinds of tape as I can remember to bring: Duct, gorilla, micropore, gaffer, spike...
Things to stave off hunger or boredom (food and eBooks)
I usually try ...
When I do theatrical design, I bring my mac, external sfx hard drive, mouse and matt, beyer 770s, and my minirator pro. That's the killer, because I can set up the PA to optimum standard before I playback my sound. Nothing worse then altering your audio, to find the rig has been garbling it up anyway.
And I shove it all in a pelicase.
I bought a carry case for my Roland R26. Its perfect as you can wear it over your shoulder and the case opens up to expose the screen and mics so you can still record while wearing it. Maybe Zoom make something similar?
I use a zoom h1 most of the time because I can carry it everywhere and it fits perfectly in the rode videomic pro dead catwhich covers the whole recorder and no one can tell what's in it, I also bought two plant mic baggies, search eBay for those, they're basically zippered linen fabric cases not designed to protect but to conceal, they fit the H1 and there'...