Portable Tool Kit - what works best?

Murray said

I do dirt bikes as well as cars. I use a dedicated small tool box to grab when I go biking. Inexpensive box with cheap tools but it works.

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i got an old truck box mounted to my trailer
it is big enough to fix a HUGE fly racing gear bag in, bout a dozen ratchet straps, a cooler, a portable grill and a socket set (you know the kind, in the hard plastic case)
does about all i need to do on the trail