Stacks everythings 67

Stack67 — Stack Everything, Up to 67!

Stack67 is a simple and effective Forge mod for Minecraft 1.21.1 that changes one of the game’s fundamental rules: maximum stack size. No more endless trips back and forth to your storage because of that 64-item cap (or worse, 16, or even 1 for certain items) — with Stack67, absolutely every item in the game can now stack up to 67 units.

Whether you’re hauling dirt, ores, potions, ender pearls, swords, or even tools that are normally limited to a single item per slot, Stack67 unifies everything at 67. That means less tedious inventory management, far more compact storage chests, and a smoother experience for players who find vanilla’s limits too restrictive — whether you’re playing classic survival, a comfort-focused modpack, or running a community server where storage efficiency matters.

How does it work technically?
The mod uses a lightweight interception (mixin) directly on Minecraft’s item-handling system, ensuring the new 67-item limit applies universally and consistently without needing to manually modify every item one by one. This approach guarantees maximum compatibility and minimal performance impact.

Key features:

• Works on all vanilla items, no exceptions, no configuration needed
• Lightweight, no external dependencies other than Forge itself
• Client and server compatible (both sides need the mod installed)
• Perfect for players looking to cut down on inventory micromanagement