RPG Extra Inventory

The mod is a work in progress that rebuilds how the inventory works, aiming at a role-playing feel in which equipment and character items matter more. It sits on top of normal play, so a world can be played with it and returned to vanilla behavior by removing the file. Its author describes it as a proof of concept and an experimental playground rather than a finished product, and notes that bugs are expected while development continues.

The inventory has a player maximum carry weight. Items add weight, and carrying more than the limit applies negative effects, which the server can configure. The mod also reports that the item capacity is effectively unlimited, with only weight restricting what a character holds. Installing it in an existing world is a deliberate choice, because the inventory data lives in a separate file in the world folder.

Environment: the server and every player need the mod. Files are published for Fabric only, for Minecraft 1.21.11, under the MIT License, and the author has not released it as open source. Skyrim Stamina and RPG Camera and Controls are the closest related options in the catalog, and the author notes that its interaction with JEI and Enough Items is still unstable.