One of the guys on my firm has one of these:
Stanley 24" Tool Tote & Organiser | Tool Totes | NoLinkingToThis
Fits his bottle, flux and solder, loctite, jet blue etc quite nicely plus with the top organiser bit he has a selection of enfeed fittings olives and that
Keep meaning to get myself one
Thats what I use as well. All soldring kit and fire extinguisher in the bottom and more common endfeed fittings in the top.
I just had to replace my blow lamp and it was cheaper to buy with a hot bag and 2 bottles of gas than just the lamp alone so might start using that instead.