I keep seeing the vacume cap extras,,, just get a pc of vacume tube or small fuel line and run it between the two vacume ports. Small zip tie on each end. It ballances the vacume and I have never had a tube break off. (And hey! I got the idea from this here forum.)
As for my list, I use a leather tool bag but carry it in my saddle bag.it includes,
Air stick
Slip Jaw pliers
Regular and phillips screwdriver
set of torx (lost the T25 of all sizes!)
small fold up set of allens
d tool
stubby wratchet w/ 1/4 and 3/8 drives
spark plug socket
vacume tube for grabbing and starting spark plugs.
self made 6ft mini jumper cable
set of 6 metric open end wrenches
some sockets
electrical tape
zip ties
spare screws and 2 BIG cressents for rear axel nut/bolt.
LED flash light in my tank bag. (2.50 right now at lowes with led key chain)
thats all I can think of right now.
Need to add fuses,,, thanks guys
(I carry all the extra stuff for the Harley guys I ride with!

)