Leather

Leather is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "It's a piece of leather."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 1 gp, and item ID 1741.

View on OSRS Wiki

Leather shows an active flip setup with a margin of +7 gp and 133,373 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 91.0k gp — high margin with healthy liquidity.