9999 stack sizes
by esoij
With 9999 stack sizes installed, most items on a server can be stacked up to 9999 per slot instead of their vanilla limits.
What it does
The mod raises the maximum stack size of every item to 9999. It is built on four mixins that change the stack limit. Only a server needs it: players join a server running the mod without installing anything. Builds exist for Fabric and Quilt across four release versions, 1.20.5 – 1.21.1, with 1.0.3 for 1.21.1 as the latest file, under All rights reserved.
Key features
Stacks of 9999
Every item can stack to 9999 in a single inventory slot, which reduces the number of slots storage needs.
Four mixins
The stack size change is applied through four mixins, so it works without altering item definitions one by one.
Server-side install
The mod runs on the server alone, and clients connecting to it do not need a copy.
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
How it compares
Balanced Stack Sizes is a Fabric mod for 1.21.3 that needs both sides and is open source under the MIT License, so it changes stacks on the client as well. I Can't Do Math! is a client-side only Fabric mod, open source under the MIT License, for 1.20 – 1.21.10, so it does not change server behavior.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| 9999 stack sizes | Fabric and Quilt | 1.20.5 – 1.21.1 | Server-side only | 2024-08-07 |
| Balanced Stack Sizes | Fabric | 1.21.3 | Client and server | 2024-12-01 |
| I Can't Do Math! | Fabric | 1.20 – 1.21.10 | Client-side only | 2025-10-18 |
Questions
Does 9999 stack sizes need to be installed on the client?
Which loaders does 9999 stack sizes support?
In the catalog
9999 stack sizes is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
this mod changes stack sizes to nine thousand nine hundred ninety nine (9999) it only uses four mixins! one for changing the stack text, one for changing the default max stack size and the absolute max stack size, one for making the game not crash, and one for changing containers max stack size i dont know what else…
Official listing
- Modrinth page
- modrinth.com/mod/9999-stack-sizes
- Owner
- esoij
- Published
- 2024-05-12
- Updated on Modrinth
- 2024-08-07
- Facts verified
- 2026-10-15