ModsFinder

ItemStackProMax

by develk-coder

With ItemStackProMax installed, a stack in a chest or inventory can hold more items than the vanilla limit, and the change applies to Fabric builds for 1.21.6.

FabricClient and serverMIT LicenseOpen source1.21 – 1.21.6

What it does

The mod is a utility that changes the maximum stack size for items. Players who want fewer slot swaps in storage can raise the limit for items that normally stack to a smaller number. Fabric API is required, and the mod is published only for the Fabric loader.

Both the server and every player need the mod, since the stack sizes must match on both ends of a connection. Builds cover 1.21 – 1.21.6, with seven release versions, and the latest file is v1.0.5-1.21.6-fabric for 1.21.6, dated 2025-07-08. The code is released under the MIT License and is open source, and public source code is available.

Key features

  1. Adjustable stack size

    The utility changes how many items fit into one slot, for items that vanilla limits to a smaller count.

  2. Fabric API dependency

    Fabric API must be installed alongside the mod, since it supplies the hooks the utility uses.

  3. Simplified Chinese text

    The mod includes Simplified Chinese language support for its text.

Compatibility

Latest build for each game version and loader.

1.21.6v1.0.5-1.21.6-fabric
1.21.5v1.0.5-1.21.5-fabric
1.21.4v1.0.5-1.21.4-fabric
1.21.3v1.0.5-1.21.3-fabric
1.21.2v1.0.5-1.21.2-fabric
1.21.1v1.0.5-1.21.1-fabric
1.21v1.0.5-1.21-fabric
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

How it compares

Full comparison

Balanced Stack Sizes is a Fabric mod for 1.21.3 that also runs on client and server and is open source under the MIT License. LoxyStackTweaks is Fabric-only for 1.21.1, is not open source and also needs both sides. Stack 99 is open source under the GNU Lesser General Public License v3.0 or later, targets 1.21.11 and is Fabric-only. Data Driven Stack Sizes is server-side only and covers 1.21 – 1.21.4, so players join without installing it.

ModLoadersGame versionsEnvironmentUpdated
ItemStackProMaxFabric1.21 – 1.21.6Client and server2025-07-08
Balanced Stack SizesFabric1.21.3Client and server2024-12-01
LoxyStackTweaksFabric1.21.1Client and server2026-07-26
Stack 99Fabric1.21.11Client and server2026-02-21
Data Driven Stack SizesFabric1.21 – 1.21.4Server-side only2025-03-15

Questions

Does ItemStackProMax require Fabric API?

Yes. Fabric API is listed as a required dependency and must be installed next to the mod on Fabric.

Does the server need ItemStackProMax too?

Yes. The server and every player need the mod installed.

Which game version should a player pick?

Files target 1.21 – 1.21.6 across seven release versions, and the latest is for 1.21.6.

In the catalog

ItemStackProMax is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 13,625 mods support Minecraft 1.21.6.

Storage mods4,058Fabric modsMods for 1.21.613,625

Similar mods

Mouse Tweaksb1.7.3 – 26.3Inventory Profiles Next1.14.1 – 26.3Clumps1.10.2 – 26.3Shulker Box Tooltip1.16.5 – 26.3Traveler's Backpack1.12.2 – 26.3Tom's Simple Storage Mod1.15.2 – 26.3

What the author says

A utility mod that allows stack size modification.
develk-coder, on the Modrinth page

Official listing

Owner
develk-coder
Published
2024-10-11
Updated on Modrinth
2025-07-08
Facts verified
2026-10-15

Tags

AdventureStorageUtility
Open on ModrinthCompare