Everything you need is in this kit to hit the water at a moments notice
The internal pockets are geared more towards photography accessories, which could be a problem if you don't plan on using this backpack as a camera bag
Fish, mostly, but you can also get some other interesting items such as crates of crafting materials, locked chests for leveling Lockpicking, clams or bloated fish containing various pearls or gems, scrolls, health and mana potions, bottles of rum that give a unique Stamina buff, bags, world drops such as green gear items and recipes, and more all covered in our Fishing Loot Guide
Obviously if you go with a lighter power rod, it's a little nicer if you're panfishing or whatever, but if you do fish from shore or you wanna throw moving baits or bigger baits for pike or catfishing or you wanna multi-species fish, it's nice to have that medium power rod
What long cast reel are you using and are there other specific long cast reels you would consider