Hemp

Hemp is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "I should use this with a spinning wheel."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 18 gp, and item ID 31457.

View on OSRS Wiki

Hemp shows an active flip setup with a margin of +66 gp and 132,682 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 858.0k gp — high margin with healthy liquidity.