My tackle box is a complicated… its several plastic bags holding various items I restocked this year! Someone stole my cat box 
But… I will put together a new one soon the same way, I already have most items on hand..
Weights from 1-6 oz in reasonable quantity(not 50# of weight)
Hooks, both circle and octopus hooks in all size incrememnts from 1/0 – 10/0.. lets face it, a 10/0 gamakatsu is overkill for a 6.5″ bullhead, a 6/0 or 7/0 is plenty. A 7″ bullhead on the other hand.. some of those get so chunky a 10/0 is barely enough
The 10/0 works well for those desperate times using a sheephead for bait also.
Barrel Swivels.. I cant remember what size they are, but the american fishing wire company makes the bst swivels I have ever used. I have never broke one, even with 100# power pro.
Scales.. I have my rapala digital (50#),and a 112# spring scale for back up.
Measuring devices. I currently have a standard construction grade tape measure in the boat, and a fabric ruler for mesuring girth. I am eventually going to mount a 72″ ruler in the boat to cover all length measuring needs.
A leatherman tool goes a long ways in the cat box 