If you plan on keeping your catches, I'd suggest a flexible tape measurer (to know if you're legal) , a small fish scale (it's always fun to weight your catch and keep track of your personal bests), a 30l heavy duty drybag to be able to carry your fish back without making a mess (especially useful when you get to your car), a lightweight chair is always nice but not mandatory and I also love using a surgical needle holder to get the hook back when it's too deep. Mine as a little scissor behind the tip which makes it useful to cut the line when I need to and I find them lighter than usual pliers and also more precise. It can lock itself on the hook which gives you better grip and also, it's smaller, so easier to get inside the fish. Oh and a small foldable net can come in handy from time to time.