Add Large Backpack Mod

A Minecraft Forge mod that adds a customizable large backpack with scrollable inventory.

🌟 Features

• 🎒 Large Backpack - Expandable storage with configurable rows (default: 10 rows / 90 slots)
• 📜 Scrollable GUI - Smooth scrollbar interface for accessing all items
• ⌨️ Key Binding - Press B key to quickly open your backpack
• 🔧 Configurable - Adjust backpack size via config file (1-20 rows)
• 🌐 Multilingual - Supports English and Japanese
• 💾 NBT Storage - Items persist in backpack data
• 🔄 Client-Server Sync - Smooth multiplayer experience

🛠️ Crafting Recipe

[Leather] [String]  [Leather]
[Leather] [Chest]   [Leather]
[Leather] [Leather] [Leather]

Materials:

• 7x Leather
• 1x String
• 1x Chest

🎮 Usage

Opening the Backpack

• Right-click while holding the backpack
• Press B key (configurable) with backpack in inventory
  • Automatically opens the leftmost backpack (hotbar → main inventory)

Using the Backpack

• Scroll using mouse wheel or drag the scrollbar
• Click to pick up/place items
• Shift+Click to quick-transfer items
• Access up to 90 slots (default: 10 rows × 9 columns)

⚙️ Configuration

Config file location: config/addlargebackpack-common.toml

[backpack]
    # Number of rows in the backpack (1-20)
    # Default: 10
    backpackRows = 10

Change backpackRows to adjust the backpack size (1-20 rows).

⌨️ Key Bindings

Default: B key opens backpack

To change:

1. Options → Controls → Key Binds
2. Find "Large Backpack" category
3. Click "Open Backpack" and press desired key

🔧 Development

Build from Source

# Clone the repository
git clone https://github.com/sedielkue/AddLargeBackpack.git
cd AddLargeBackpack

# Build the mod
.\gradlew build

# Output: build/libs/addlargebackpack-1.0.jar

Run in Development

# Run client
.\gradlew runClient

# Run server
.\gradlew runServer

🔍 Technical Details

Features

• Client-Server Synchronization - Scroll position synced across network
• Dynamic Slot Mapping - Efficient slot indexing for scrollable inventory
• NBT Storage - Items persist in backpack data
• Smart Slot Restriction - Prevents placing backpack inside itself
• Left-Priority Search - Keybind opens leftmost backpack first

Requirements

• Minecraft: 1.20.1
• Forge: 47.4.0 or higher
• Java: 17 or higher

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

👤 Credits

• Developer: sedielkue
• Texture: Custom backpack texture
• Framework: Minecraft Forge

🐛 Support

• Issues: GitHub Issues
• Wiki: Documentation

📝 Changelog

Version 1.0.0 (Initial Release)

• ✅ Configurable large backpack (up to 20 rows / 180 slots)
• ✅ Scrollable GUI with smooth scrollbar
• ✅ Key binding support (B key, configurable)
• ✅ Crafting recipe (leather + string + chest)
• ✅ NBT item storage with persistence
• ✅ Client-server synchronization
• ✅ Left-priority backpack search
• ✅ English and Japanese translations
• ✅ Custom backpack texture

Enjoy your adventures with extra storage! 🎒✨