This is A Zapatera Challenge flag from season 22 of Survivor - Redemption Island, this season brought back 2 previous contestants and the redemption island twist where a contestant gets a 2nd chance to win the million dollars.
The challenge flag is in Zapatera's colours (Purple) and features a different pattern to the Ometepe and Murlonio challenge flags. This was used at all the challenges/Immunities at the start of the game.
Please feel free to check out my other items and leave a comment :) I'm always on the hunt for Survivor items :)