Blue cape

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

In-game examine text: "A thick blue cape."

It has a Grand Exchange buy limit of 150 every four hours, a high alchemy value of 19 gp, and item ID 1021.

View on OSRS Wiki

Blue Cape shows an active flip setup with a margin of +40 gp and 812 trades over the last 24 hours.

At the buy limit of 150 every four hours, max profit per cycle is about 6.0k gp — high margin with healthy liquidity.