Line Capacity
From The Angler's Dictionary — your encyclopedia of fishing rods, reels, and tackle
Line capacity is the amount of fishing line a reel's spool can hold, typically measured in yards at a given line weight. For example, a reel rated at '200/10' holds 200 yards of 10-pound test monofilament. Most reel spools list multiple line weight options — 200/10, 180/12, 160/14 — because thicker lines take up more spool space.
Adequate line capacity matters for different fishing scenarios. For bass fishing in ponds and small lakes, 100-150 yards of line is usually plenty. For offshore trolling, you may need 300-600 yards to handle long runs from powerful pelagic fish. For surf fishing, 200-300 yards gives you enough line for long casts and strong currents.
Braided line is significantly thinner per pound test than monofilament or fluorocarbon, so the same spool holds considerably more braid. A reel that holds 200 yards of 10-pound mono might hold 300+ yards of 10-pound braid. Many anglers exploit this by spooling braided backing first, then topping with a monofilament or fluorocarbon mainline — getting the best of both worlds. Overfilling a spool causes line to jump off in tangles, while underfilling reduces casting distance. The ideal fill level is about 1/8 inch below the spool lip.