

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).
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as itemsstack-1.2.0.jar — drop this file into the mods folder
- Download size: 25 KB
- Download link checked 30 Aug 2026 — working
These come from our own check of the pack file, not from the source page.