# Arcane Backpacks
\nA Fabric mod for Minecraft 1.21.11 that adds tiered portable storage with upgrades, fluid\/XP tanks, and deep customisation.<\/p>\n
—<\/p>\n
## Features<\/p>\n
### 7 Backpack Tiers
\n| Tier | Default Size | Upgrade Slots |
\n|—|—|—|
\n| Standard | 3\u00d79 | 1 |
\n| Iron | 4\u00d79 | 2 |
\n| Copper | 4\u00d79 | 2 |
\n| Golden | 5\u00d79 | 3 |
\n| Silver | 5\u00d79 | 3 |
\n| Diamond | 7\u00d79 | 4 |
\n| Obsidian | 8\u00d79 | 6 |<\/p>\n
All values are configurable per-tier via the in-game ModMenu config screen.<\/p>\n
### Stack Upgrades
\nSix tiers of stack upgrades that multiply the maximum stack size in the backpack. Multiple upgrades stack **multiplicatively**.<\/p>\n
| Upgrade | Multiplier |
\n|—|—|
\n| Starter | \u00d71.5 |
\n| Tier 1 | \u00d72 |
\n| Tier 2 | \u00d74 |
\n| Tier 3 | \u00d78 |
\n| Tier 4 | \u00d716 |
\n| Omega | Unlimited (2,147,483,647) |<\/p>\n
Slots with more than 999 items display compact counts (`1k`, `2k`, `1M`, etc.). Hold **Shift** to reveal the exact number.<\/p>\n
### Item Filter Upgrade
\nControl exactly which items can enter the backpack. Configure up to 9 filter slots with **Whitelist** or **Blacklist** mode. Scope can be set to apply to all insertions or magnet pickups only.<\/p>\n
**Advanced Item Filter Upgrade** offers 18 filter slots for finer-grained control.<\/p>\n
### Tank Upgrade (3 Tiers)
\nAdds a fluid + XP storage tank to the backpack. Three tiers with increasing capacity.<\/p>\n
– **Left-click** the XP bar \u2014 deposit all player XP
\n– **Right-click** the XP bar \u2014 withdraw all XP
\n– **Middle-click** the XP bar \u2014 open custom transfer popup (supports `k`\/`M` shorthand, e.g. `5k`, `2.5M`)
\n– Left\/right-click water or lava bars with a bucket to fill or drain<\/p>\n
Tank data is saved to the upgrade item when removed, so it persists across backpacks.<\/p>\n
### Refill Upgrade
\nAutomatically tops up partial item stacks in the backpack from its own inventory on a server tick.<\/p>\n
### Quick Transfer
\nShift-click a backpack in your inventory to instantly move all eligible items from your inventory into it. Respects the Item Filter if one is installed.<\/p>\n
### Backpack Preview
\nHover over a backpack in your inventory to preview its contents as a compact grid. Hold **F3+H** for a full itemised list.<\/p>\n
### Customisation
\n– **Custom name** \u2014 click the backpack name in the GUI to rename. Supports `&` colour codes (e.g. `&bMy Backpack`).
\n– **Custom icon** \u2014 assign any item as the backpack’s display icon.
\n– **Bag-in-bag** \u2014 store backpacks inside backpacks (configurable, loop-protected).<\/p>\n
### Placement
\nRight-click to place a backpack as a block in the world. It functions identically to the item \u2014 upgrades, tank, and inventory all work in placed form.<\/p>\n
### Trinkets Integration
\nBackpacks can be equipped in the **Back** slot via the Trinkets mod. All features (renaming, tank interaction, stack upgrades) work correctly from the trinket slot.<\/p>\n
### Keep on Death
\nOptionally keep backpacks on death \u2014 works for both inventory and Trinkets slot (configurable).<\/p>\n
—<\/p>\n
## Config (ModMenu)
\nOpen the config screen via **ModMenu \u2192 Arcane Backpacks**. Per-tier settings:
\n– Enable\/disable each tier
\n– Rows and columns
\n– Upgrade slot count<\/p>\n
Global settings: Allow Bag in Bag, Keep on Death, Can Burn.<\/p>\n
—<\/p>\n
## Requirements
\n| Dependency | Version |
\n|—|—|
\n| Minecraft | 1.21.11 |
\n| Fabric Loader | \u2265 0.18.0 |
\n| Fabric API | \u2265 0.140.0 |
\n| Java | 21 |<\/p>\n
**Optional:** Trinkets 3.11.0+, ModMenu<\/p>\n
—<\/p>\n
## Installation
\n1. Install Fabric Loader for Minecraft 1.21.11
\n2. Download Fabric API
\n3. Drop `arcanebackpacks-1.1.0-fabric-mc1.21.11.jar` into your `mods\/` folder
\n4. Launch the game<\/p>\n
—<\/p>\n
## Building from Source
\n“`bash
\ngit clone https:\/\/github.com\/Abytzu\/arcane-backpacks
\ncd arcane-backpacks
\ngradlew build
\n“`
\nOutput JAR will be in `build\/libs\/`.<\/p>\n
—<\/p>\n
## License
\nMIT \u2014 see [LICENSE](LICENSE)<\/p>\n
—<\/p>\n
## Links
\n– Modrinth
\n– Issues<\/p>\n","protected":false},"excerpt":{"rendered":"
Tiered backpacks for Fabric 1.21.11. 7 tiers (Standard \u2192 Obsidian), multiplicative stack upgrades, fluid\/XP tank, refill upgrade, custom names & icons, Trinkets integration, and full ModMenu config.<\/p>\n","protected":false},"featured_media":17977,"template":"","meta":{"_minecraft_slug":"arcane-backpacks","_minecraft_project_id":"4OsR61Nh","_minecraft_author":"Abytzu","_minecraft_license":"MIT","_minecraft_downloads":66,"_minecraft_follows":0,"_minecraft_client_side":"required","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"arcane-backpacks.zip","_minecraft_size_bytes":477781,"_minecraft_version_count":2,"_minecraft_updated_at":"2026-05-16T15:02:40.141222Z","_minecraft_date_created":"2026-04-28T00:36:57.071427Z","_minecraft_date_modified":"2026-04-26T17:14:19.265533Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/arcane-backpacks","_minecraft_icon_attachment_id":17977,"_minecraft_imported_at":"2026-05-31T19:50:29+00:00","_minecraft_import_hash":"23e1d6ec0a37798f306d1df8388881e6","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[97],"mod_loader":[99],"minecraft_version":[41],"class_list":["post-17976","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-fabric","mod_loader-fabric","minecraft_version-1-21-11"],"yoast_head":"\n