In Prologic Flyff we have some nice features related to the extra bags to improve your experience
The size of the extra bags it's x2 the normal size, so you have plenty of space to storage your items.
On item pick-up if you don't have space in your inventory the item will go to your first available extra bag.
On item pick-up If you have the stack-able item in your bag will go directly to the bag where the item is placed.
You can organize items in all the extra bags.
You can use buff items from the Extra bags
Also related to the inventory, if you click anywhere in your inventory you will see a menu to sort your inventory by type.
And there is, if you have ideas to improve the system let us know. Enjoy your stay!