Using third-party scripts or "OP GUIs" in games like Roblox can lead to:
Custom layouts that may allow for more slots than the standard backpack. How They Are Implemented (Scripting Logic) OP Backpacking GUI
Modifies player movement (WalkSpeed and JumpPower) to traverse the open world faster. Using third-party scripts or "OP GUIs" in games
Automatically teleports to and collects "Marshmallows," the game's primary currency. OP Backpacking GUI
How to Make a Custom Backpack GUI | Roblox Scripting Tutorial
Since the default system is disabled, the script uses Humanoid:EquipTool(tool) to manually handle item selection.