A hard tackle box is fine until you walk more than a few steps from the truck, and then it is just an awkward suitcase full of lures. A good pack puts your trays, tools, and a couple of rods on your back so both hands stay free to cast, scramble down a bank, or wade out to a spot. The first thing to settle is carry style, since that decides most of what follows.
There are two main shapes. A full backpack rides on two shoulder straps, holds more, and usually fits three to six standard tackle trays, so it suits anglers who carry a lot or hike to their water. A sling bag rides on one shoulder and swings around to your chest for quick access without taking it off, which makes it faster on the move and lighter to wear, though it holds less. If you mostly fish from one spot with a big spread of lures, lean backpack. If you cover ground and want grab-and-go access, lean sling.
After carry style, look at three practical things: how many tackle trays it actually fits (and whether any are included), whether it has molded rod holders so you can free a hand to re-tie, and whether it shrugs off rain. Most freshwater packs are water-resistant rather than fully waterproof, which is fine for a drizzle but not a downpour, so a few include a rain cover. The picks below span a lightweight sling to a premium pack with a built-in light, and each one earns its spot on real buyer ratings.