I see someone else has discovered the Home Depot aluminum case....It's perfect as a pit box. Mine's a little more crowded but everything fits.
Behind the top flap I keep a pit towel and a zipper pouch with zip ties, shrink wrap, a soldering iron and solder, a handful of fittings, adapters, etc.
In the flap itself I keep my temp gun, a magnetic parts tray, Losi multitool, OFNA plug wrench, body shears, a couple small pairs of scissors, angled long tipped needle nose pliers, a couple of old toothbrushes and a brush, Sharpie and pens, magnetic tipped parts-picker-upper-thing, turnbuckle wrench, extendable mirror, flashlight, pair of needle nosed Vice Grips, a small hammer and hole punches, glow plug igniter, straight needle nose pliers, and wirecutters.
In the bottom there's the charger, two of the GS Racing tool bags, a pair of gloves, a regular pair of Vice Grips, a regular pair of Channel Lock pliers, a few little cases of misc. small tools and parts, a package of 3x3 ziplock bags (you never know when you might need them!), and underneath the charger's wires are a rechargeable Dremel and a spare igniter.
The Blue GS tool bag has SAE tools and screwdrivers in it and the black one has the metric tools, spring tools, ratchets, reamers, knife, etc.
It seemed like any time I'd go to the track with anything less I'd always need the one thing I'd left behind.
Not any more.