For those interested in the technical side of how these custom GUIs are built:
While specific versions vary, common functionalities in these scripts often include: OP Backpacking GUI
Since the default system is disabled, the script uses Humanoid:EquipTool(tool) to manually handle item selection. For those interested in the technical side of
How to Make a Custom Backpack GUI | Roblox Scripting Tutorial OP Backpacking GUI
Modifies player movement (WalkSpeed and JumpPower) to traverse the open world faster.