
Items Stack
Allows changing of item's max stack sizes.
Screenshots

About this Mod
Allows you to change any item's stack size.
Requires owolib, recommended to use modmenu.
Open the config screen/file (if not using through modmenu the file name should be items-stack-size-config.json5) and add the wanted item name to the items list and its stack size to the Max Stack Sizes list, an example of how the json would look, this is a possible json to use for the mod's icon changes:
{
"items": [
"minecraft:potion",
"minecraft:stone"
],
"maxStackSizes": [
8,
32
],
"itemTags": [
"#minecraft:boats"
"#c:tools"
],
"maxTagStackSizes": [
16,
4
]
}
This mod is intended to be used as client and server though it has limited compatibility for server only (it works only in survival and then some features may still not work).
Available Versions
How to Install Items Stack 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).
Install Mod
Open the mod browser in the dashboard and search for "Items Stack". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Items Stack 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). You can switch loaders with one click in the panel.
Is Items Stack compatible with fabric?
Items Stack officially supports fabric for Minecraft 1.21. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Items Stack – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Items Stack 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.
Similar Mods
Rent Modded Server
Install Items Stack with just one click on your server.