Are there any LEGO "MacGyvering kits" for the on-the-go LEGO fan? I keep a small box of electronic parts in the car, for times when I get an idea I want to try out, or have a quick gizmo that I need to solve a problem.  I also have a box of mechanical parts, like strings and pulleys and weights, that I'll use sometimes.  When I hang out with my engineering friends, we'll often come up with ideas that we can quickly build and test.  It seems that I should put together a similar set of LEGO parts.

I'm looking at a target volume about 3200 cm&sup3; (200 cubic inches, 3.4 quarts), including space for organization.  No individual element should be larger than 140mm&times;230mm (17&times;23 studs).  The most important goal is versatility.  I'm mostly orienting this towards engineering tasks, but may also throw in a few minifigs for decorative builds.

The best idea I currently have is to use the Creative Suitcase, and augment it with parts from one of the smaller Technic kits that's almost entirely general-purpose Technic parts, like the Compact Tracked Loader.

It seems likely that people have built similar "on-the-go" kits, or have their "hotlist" of LEGO parts that are always at hand when prototyping.  Any thoughts on the matter?
It seems like you have the parts in mind, but really just need a case. 

I have used fishing tackle boxes and artist supply boxes, but the compartments were too narrow. 

Pros: Versatile, cheap, stackable, configurable. 
You can use the removable compartments as parts trays during builds. You can find them in various colors at the major discount retailers in the U.S. 

Cons: No handle. Not durable. If you drop or step on them, the hinges will crack. 

Dimensions


13 3/8" L x 10 3/4" W x 2 1/2" H
34 cm x 27.3cm x 7.9cm




Listing at the Sterlite website