ModsJava
IG Stack Size Adjuster Mod (26.3, 1.20.1) – Hold Thousands of Blocks
Java mod listed for Minecraft 1.20. Downloads from the MC Java Mods app on Android.
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IG Stack Size Adjuster Mod raises the default stack limit for items and blocks in your world. You can hold up to 9,999 items in a single inventory slot instead of stopping at 64. This change helps you clear clutter from your storage rooms and carry massive amounts of building blocks on long trips. The mod keeps hoppers, droppers, and villager trades working normally without breaking your automated systems.
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Features:
- Massive Stack Limits: Increases item stacks from 64 up to 9,999 items in a single inventory space.
- Protected Redstone Systems: Keeps hoppers and droppers moving exactly one item per tick so sorting machines do not jam.
- Safe Trading Menus: Protects villager and wandering trader trades from breaking or overflowing during exchanges.
- Condenses chests and shulker boxes to hold thousands of materials in fewer storage slots.
- Smooths out shift-clicking in crafting tables so leftover items do not drop onto the ground.
- Includes tag support to keep items like filled shulker boxes unstackable.
- Allows players to carry thousands of dirt, cobblestone, or wood blocks without filling their inventory.
Configuration:
stack_size_adjuster:max_stack_size: Sets the highest number of items allowed in one stack.stack_size_adjuster:affect_blocks_only: Limits stack increases strictly to placeable blocks when set to true.stack_size_adjuster:enable_food_stacking: Turns on larger stack sizes for edible food items.stack_size_adjuster:protect_shulker_boxes: Stops filled shulker boxes from stacking inside each other.
How to Use:
- Open your inventory or a chest containing regular stacks of items.
- Shift-click matching blocks together to combine them into one large stack.
- Adjust stack settings anytime using the in-game gamerule settings or config menu.
Screenshots:




IG Stack Size Adjuster Mod Download Links
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- 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: In MC Java Mods, or directly above on this page.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Downloads as 522070.mcaddon
- Download size: 919 KB
- Download link checked 6 Oct 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.