The right size depends largely on your fishing style, the duration of your outings, and how much gear you typically carry. If you’re a minimalist angler who enjoys quick sessions on small streams, a compact chest pack or a lightweight vest with just a few pockets may be all you need. For full-day trips or situations where you need extra fly boxes, tippet spools, water, food, or a rain jacket, a larger sling or hip pack provides more storage and comfort. Vests are great for anglers who like everything neatly organized in front of them, while packs tend to offer more versatility and capacity. Also consider where you’ll be fishing—traveling anglers or those fishing remote waters often benefit from extra room for essentials, while local day-trippers can get by with smaller, lighter options. Many modern pack systems are also designed to integrate seamlessly with larger backpacks, making them a great choice for multi-day trips or anglers who hike long distances to reach the water. Comfort, fit, and adjustability should guide your choice, ensuring the pack or vest doesn’t restrict movement while casting or wading.