FatStack

(Stack size overhaul) Configurable max stack sizes for all items

470 Downloads

fabricequipmentmanagementutility

Rent Server with this Mod

About this Mod

FatStack adds a config file to change the default max stack size for all items.

At startup it'll generate a config file with a set of defaults, and that config file can be changed to change the default max stack size of any item.

The mod can be run purely on the server, and when items are sent to the client they spoof the minecraft:max_stack_size item component, so the clients are notified of the changes.

Available Versions

FatStack 1.1+mc.1.21.10release

MC 1.21.9, 1.21.10fabric

October 19, 2025

FatStack 1.0+mc.1.21.9release

MC 1.21.9, 1.21.10fabric

October 6, 2025

How to Install FatStack on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.10).

Install Mod

Open the mod browser in the dashboard and search for "FatStack". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.10, 1.21.9

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

FatStack server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.10). You can switch loaders with one click in the panel.

Is FatStack compatible with fabric?

FatStack officially supports fabric for Minecraft 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with FatStack – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if FatStack consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.