For what it's worth, this is a rundown of the sort of stuff I take for a Chesil trip. I tend to aim to fish the best parts of the tides in shortish sessions rather than camp out over several tides but there are plenty who go for the long session approach.
I prefer a seat box for this type of fishing and use a Shakespeare Beta box with the Breakaway conversion. This allows the box to be carried on your back like a rucksack which leaves your hands free and distributes the weight well. You can then sit on it rather than having to take an extra seat or sit on the stones. I usually take a couple rods and a tripod as well as a beach buddy. These are all strapped together with neoprene rod straps. I've used quiver type rod holdalls in the past but nowadays I just carry this bundle in one hand. Need to be a bit more careful not to damage rod tips but this method works for me.
In the seat box I take a couple reels, a cloth to keep my hands clean (an old flannel), food and water (depending on the length of the planned trip), a printout of the tide prediction and weather forecast and any other written notes, bait in sandwich boxes, plastic bags to put rubbish in and a small LED base camp light. LEDs are so good nowadays that a very small and light unit is fine. Some folks seem to want to go into competition with the Portland Bill lighthouse but I don't think that's necessary and bigger units just add weight.
A small zip-up bag (it was a wash bag before being re-purposed) with priest, scissors (I like the Mustad ones), forceps, small spare torch (1 x AA battery size), a small reel-type tape measure (plastic because I've found the metal ones rust and can slice your fingers when they retract quickly), an LED torch that clips on to the tripod and can be directed on to the rod tips, forceps for unhooking, a diamond nail file for keeping hooks sharp and bait elastic.
Then a rig wallet with plenty of pre-tied rigs, a list of the minimum sizes for the various species, some spare shock leaders (I like the Varivas tapered ones), antiseptic wipes, plasters and a waterproof notebook and pen).
If you just chuck leads into the box it's easy to spike your fingers on the grip wires so I put the leads in a sandwich box.
For me, this strikes a reasonable balance between covering the essential requirements and keeping the weight down. As you biuld up experience you'll evolve your own preferences. For example, I only take a couple spare leads because I don't often lose any when fishing Chesil. If you fish somewhere with a rougher seabed you'll want to take more. Some people prefer pliers for unhooking as forceps can feel a bit 'flimsy'. It's a good idea to have an insulated bait box for frozen baits. At other venues I might take an empty bucket for sea water or a small thermometer for measuring the sea temperature. I don't take these on Chesil trips because I want to stay well back from the waves to increase my chance of getting home alive.
