Stack99

A simple NeoForge mod for Minecraft 1.21.1 that increases item stack sizes to Minecraft's maximum limit of 99 items.

Features

• 2 Configuration Options: VANILLA (64) or MAX (99)
• Works Immediately: Default is MAX - install and play
• 1150+ Items: Automatically modifies all stackable vanilla and modded items
• GUI Configuration: Easy in-game config screen
• Modern Implementation: Uses Minecraft 1.21.1's Data Components system
• Universal Compatibility: Works with all modded items

Compatibility

✅ All vanilla items ✅ All modded items (Create, Mekanism, AE2, etc.) ✅ Multiplayer compatible ✅ No conflicts with other mods

FAQ

Q: Why only 99? A: Minecraft 1.21.1 has a hard-coded limit of 99 items per stack. Higher values get clamped to 99 by the game engine.

Q: Does this work with modded items? A: Yes, automatically applies to all stackable items.

Q: Do I need to restart after changing config? A: Yes, stack sizes are set during world initialization.

Requirements

• Minecraft: 1.21.1
• Mod Loader: NeoForge 21.1.73+
• Java: 21