Custom Inventory and Items is now available as an Experimental feature in v37.40, enabling you to customize, modify, or completely replace the default player inventory system. You can create fully custom items with unique properties, design gameplay that reacts to player inventories, and build systems like in-game economies, crafting mechanics, and more!
During the Experimental phase, publishing won’t be available but you’ll be able to test and provide feedback on this feature while it’s under development. Custom Inventory and Items Feedback Thread
Check out the Custom Inventory documentation for more details.