✦ Probably Backpacks ✦

Tiered Backpack System with Upgrades for Spigot & Paper

Leather · Copper · Iron · Gold · Diamond · Netherite
Custom Textures · Upgradeable · 3D Models · CuriosPaper Addon

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Think of it as Sophisticated Backpacks — but for Paper & Spigot, with 3D models, rich upgrades, and a seamless accessory integration.

CAUTION

⚠️ NO NEW CONTENT UPDATES FOR THIS VERSION

This standard version of Probably Backpacks is feature-locked and will NOT receive any new content updates or features. It will only receive maintenance updates to maintain compatibility with newer Minecraft/Paper releases.

⚜️ Want new features, security, party storage, and advanced upgrades? Upgrade to Probably Backpacks Premium on BuiltByBit to get access to:

• 🔑 PIN-Pad Security Locks — Prevent pickpocketing with a 4-digit code GUI
• 👥 Synchronized Party Storage — Link backpacks across teammates in real-time
• 🍳 Smart Auto Smelter — Intelligently route items to furnace/smoker/blast modules
• 🧪 XP Sponge & Auto Repair — Absorb XP orbs and auto-repair durability
• 🛢️ Fluid Tank Upgrade — Store up to 10 buckets of fluid
• ⚡ Auto Sort Upgrade & 🛡️ Whitelist Filters
• 🕵️ Stealth Pickpocketing & 🎨 Custom 3D Cosmetic Skins

👉 Click here to get Probably Backpacks Premium on BuiltByBit!

✦ What is Probably Backpacks? ✦

Probably Backpacks adds a complete tiered backpack system to your Minecraft server. Players craft backpacks from Leather all the way up to Netherite — each tier offering more storage and more upgrade slots.

Backpacks are equipped in the CuriosPaper Back slot and are visible on the player's back as a 3D model! This plugin is a CuriosPaper addon, hooking into the accessory system to provide a seamless experience with custom textures, real-time dyeing, and a powerful upgrade system.

This plugin requires CuriosPaper to function!

🚀 What's New in v2.4

• 📥 Autonomous Pickup Task (PickupTask): Dedicated background task for the Pickup Upgrade that checks a 1.5-block radius around players to collect nearby item drops directly into active backpack storage (smartly skips duplicate work if MagnetTask is active).
• 🛠️ Modern Paper & 1.21.4+ Version Parsing: Overhauled VersionUtil with regex matching to support Paper build version strings (e.g., 26.2.build.48-alpha) with automatic fallback to Bukkit.getVersion().
• 🔒 Robust Item & Component Sanitization: Added multi-layered fallback deserialization in BackpackData to strip unregistered/legacy enchantments and invalid item components cleanly.
• ⚙️ GUI Slot Bounds Protection: Added slot boundary safety checks during inventory click processing.

✦ Features ✦

🎒 Core Backpack System

✦ Backpack Tiers ✦

Each tier requires the previous backpack as an ingredient — creating a natural progression chain!

✦ Upgrades ✦

Upgrades are placed into the backpack's upgrade slots to grant powerful abilities:

🛠️ Utility Upgrades

🧺 Automation Upgrades

🍳 Cooking Upgrades

🗄️ Storage Upgrades

✦ Dyeing & Mobs ✦

🎨 Dyeing System

Express yourself with over 16 unique colors! Leather backpacks can be dyed directly within the backpack inventory.

• Simple Dyeing: No complex GUIs! Simply drop any Minecraft dye onto the dye button in the backpack interface.
• Remove Color: Use a Water Bucket on the dye button to clear the color.
• Live Updates: The 3D model on your back updates instantly when you change the color.

🧟 Mob Drops

Backpacks aren't just for players anymore! Zombies and Skeletons have a small chance to spawn wearing a backpack.

• Visual Models: You can see exactly which tier of backpack a mob is wearing.
• Lootable: Defeat the mob for a chance to collect their backpack!
• Configurable: Adjust spawn rates and which tiers mobs can carry in the config.yml.

✦ Recipes ✦

🎒 Backpack Recipes (click to expand)

🟤 Leather Backpack Slots: 27 · Upgrade Slots: 1 The starting tier backpack. Requires basic materials to craft. String Leather String String Chest String Leather Leather Leather

🟠 Copper Backpack Slots: 45 · Upgrade Slots: 2 An upgrade from leather — requires copper ingots and a Leather Backpack. Copper Ingot Copper Ingot Copper Ingot Copper Ingot 🟤 Leather Backpack Copper Ingot Copper Ingot Copper Ingot Copper Ingot

⚪ Iron Backpack Slots: 54 · Upgrade Slots: 3 Solid mid-tier storage. Requires iron ingots and a Copper Backpack. Iron Ingot Iron Ingot Iron Ingot Iron Ingot 🟠 Copper Backpack Iron Ingot Iron Ingot Iron Ingot Iron Ingot

🟡 Gold Backpack Slots: 81 · Upgrade Slots: 4 High-capacity storage with plenty of room for upgrades. Gold Ingot Gold Ingot Gold Ingot Gold Ingot ⚪ Iron Backpack Gold Ingot Gold Ingot Gold Ingot Gold Ingot

🔵 Diamond Backpack Slots: 108 · Upgrade Slots: 5 Premium-tier storage. Only one step away from the ultimate backpack. Diamond Diamond Diamond Diamond 🟡 Gold Backpack Diamond Diamond Diamond Diamond

🟣 Netherite Backpack Slots: 120 · Upgrade Slots: 6 The ultimate backpack. Features fire and lava immunity (won't burn when dropped). Crafted at a Smithing Table using the Netherite Upgrade template. Component Item Template Netherite Upgrade Smithing Template Base 🔵 Diamond Backpack Addition Netherite Ingot

⬆️ Upgrade Recipes (click to expand)

🛠️ Upgrade Base The fundamental component for crafting most upgrades. String Iron Ingot String Iron Ingot Leather Iron Ingot String Iron Ingot String

🔧 Crafting Station Adds a portable crafting table to your backpack. Oak Planks Crafting Table Oak Planks Oak Planks 🛠️ Upgrade Base Oak Planks Oak Planks Crafting Table Oak Planks

📥 Pickup Upgrade Auto-collects picked-up items into the backpack. Piston String 🛠️ Upgrade Base String Redstone Redstone Redstone

🧲 Magnet Upgrade Pulls nearby items directly into your backpack. Requires the Pickup Upgrade. Ender Pearl Iron Ingot Ender Pearl Iron Ingot 📥 Pickup Upgrade Iron Ingot Redstone Diamond Lapis Lazuli

🍖 Feeding Upgrade Auto-feeds the player using food stored in the backpack. Golden Carrot Golden Apple 🛠️ Upgrade Base Glistering Melon Slice Ender Pearl

🔄 Refill Upgrade Auto-refills hotbar items from the backpack as they deplete. Ender Pearl Iron Ingot 🛠️ Upgrade Base Iron Ingot Redstone Chest Redstone

📦 Compacting Upgrade Auto-compresses items into their block forms. Iron Ingot Piston Iron Ingot Piston 🛠️ Upgrade Base Piston Redstone Piston Redstone

⚔️ Tool Swapper Auto-swaps to the best tool for the block you are mining. Redstone Wood Sword Redstone Wood Pick 🛠️ Upgrade Base Wood Axe Iron Ingot Wood Shovel Iron Ingot

🔨 Anvil Upgrade Adds a portable anvil to your backpack. Anvil Diamond Anvil Iron Ingot 🛠️ Upgrade Base Iron Ingot Chest

🎵 Jukebox Upgrade Play music discs directly from your backpack's GUI. Jukebox Iron Ingot 🛠️ Upgrade Base Iron Ingot Redstone

🛠️ Smithing Upgrade A portable Smithing Table for your backpack. Smithing Table Iron Ingot 🛠️ Upgrade Base Iron Ingot Chest

🔥 Smelting Upgrade Smelts items automatically while you travel. Redstone Iron Ingot Redstone Iron Ingot 🛠️ Upgrade Base Iron Ingot Redstone Furnace Redstone

💨 Blasting Upgrade High-speed smelting for ores and materials. Redstone Iron Ingot Redstone Iron Ingot 🛠️ Upgrade Base Iron Ingot Redstone Blast Furnace Redstone

🍖 Smoker Upgrade Rapidly cooks food items while you're on the move. Redstone Iron Ingot Redstone Iron Ingot 🛠️ Upgrade Base Iron Ingot Redstone Smoker Redstone

🟠 Copper Stack Upgrade Increases max stack size in the backpack to 96. Copper Block Copper Block Copper Block Copper Block 🛠️ Upgrade Base Copper Block Copper Block Copper Block Copper Block

⚪ Iron Stack Upgrade Increases max stack size in the backpack to 128. Iron Block Iron Block Iron Block Iron Block 🟠 Copper Stack Upgrade Iron Block Iron Block Iron Block Iron Block

🟡 Gold Stack Upgrade Increases max stack size in the backpack to 256. Gold Block Gold Block Gold Block Gold Block ⚪ Iron Stack Upgrade Gold Block Gold Block Gold Block Gold Block

🔵 Diamond Stack Upgrade Increases max stack size in the backpack to 512. Diamond Block Diamond Block Diamond Block Diamond Block 🟡 Gold Stack Upgrade Diamond Block Diamond Block Diamond Block Diamond Block

🟣 Netherite Stack Upgrade Increases max stack size in the backpack to 1024. Netherite Block Netherite Block Netherite Block Netherite Block 🔵 Diamond Stack Upgrade Netherite Block Netherite Block Netherite Block Netherite Block

✦ Stats & Support ✦

Join the Discord!

discord.gg/r5YXqgrGya

Get help · Report bugs · Suggest features · Stay updated

✦ Geyser & Bedrock Edition Support ✦

Probably Backpacks provides full GUI slot icon and backpack 3D model support for Bedrock Edition players joining via GeyserMC.

• Automatic Setup: If Geyser is running on the same server, Probably Backpacks will automatically detect Geyser's folder on startup, extract the mappings and resource pack, and copy them directly to Geyser's packs/ and custom_mappings/ folders.
• Manual Setup (Proxy/Separate Server): If Geyser is hosted on a separate proxy (e.g. Velocity/BungeeCord) or automatic setup is skipped:
  1. Retrieve the files from your server's plugins/ProbablyBackpacks/geyser/ directory (extracted on startup).
  2. Copy ProbablyBackpack_Geyser.zip into your Geyser packs/ folder.
  3. Copy ProbablyBackpacks_mappings.json into your Geyser custom_mappings/ folder.
  4. Ensure enable-custom-content is set to true in Geyser's config.yml and restart Geyser.

✦ Quick Start ✦

1. Download CuriosPaper.jar and ProbablyBackpacks.jar
2. Drop both into your server's plugins/ folder
3. Restart the server
4. Craft a Leather Backpack and equip it in the CuriosPaper Back slot
5. Use the Double-Sneak hotkey — you're all set!