Plant Fiber

Compost it or ignore it. No item on this site lists plant fiber as an ingredient, and its own description names a single use: the composter. You get it from plants that have died, most often crops in your own planters that went too long without water or light.

So it only matters if you farm. Drop the fiber into the composter along with other compostable leftovers and it comes back out as fertilizer, which raises the ground condition in a large planter box so the next round grows better. A base that turns hemp seeds into cloth, or grows its own food, can run that loop all wipe.

If you never plant anything, the fiber in your inventory is dead weight. Drop it before you head out to fight, so the slot holds something useful.