Red cape

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

In-game examine text: "A bright red cape."

It has a Grand Exchange buy limit of 150 every four hours, a high alchemy value of 1 gp, and item ID 1007.

View on OSRS Wiki

Red Cape shows an active flip setup with a margin of +13 gp and 2,538 trades over the last 24 hours.

At the buy limit of 150 every four hours, max profit per cycle is about 1.9k gp — high margin with healthy liquidity.