On OSRS latest game update, they upgraded functionality of the looting bag.
The Looting bag has received a big update to its functionality! It now has an Open option which, when selected, makes every item you pick up go straight into the Looting bag whilst in the Wilderness. Items will go into your inventory when the Looting bag is closed. You can still Check to see the contents of the bag by right-clicking.
People barely use looting bag currently on BS, so this would be great addition on here also.