I still use the same tool box I found 30 odd years ago coz it fits in my rucksack and seems to be the right size. I also carry a zig disc (fox) - thats good because it's 1ft round so use as a measure and rig storage.
Theres lots of stuff I rarely use which lives in a big rig wallet - only goes in the car on big trips where I dont know what might happen, multiple zig lines, bait drills and corks, various leaders, tubing sets, spares on top of spares.
I used to carry a big float tube full of spods, marker floats, floater floats - again only on big trips - but left in car.
For normal fishing trips (95%) of the time I carry just one spare spod, one floater/zig line, one marker float, PVA funnel web all in the lid of my rucksack, one tackle box FULL of rig making essentials, rig box (Korda) and the zig disc (Fox).
Spare leads can stay in the car, I carry some in a lead pouch - enough for a few fish, back to the car if I run out.
You could spend a fortune buying all new stuff that goes together perfectly or just make what you've got work - I'm kind of reviewing what I need on a venue to venue basis.