PackingCube

A modular bag system for Minecraft 1.21.1 on NeoForge. Fit functional pouches into a backpack, open them from a radial menu, and let the bag keep the tools you reach for stocked.

Instead of digging through chests and shuffling stacks, you configure the bag once: which items each pouch accepts, which slot gets refilled, and which pouch wins when two of them want the same item.

Development

A significant portion of this mod's code was written with the assistance of AI tools. Development involved iterative testing, debugging, and refinement.

Requirements

Install

1. Install NeoForge for 1.21.1.
2. Put packingcube-<version>.jar into your mods/ folder.
3. Launch the game. The mod works without Curios; with Curios the backpack can sit in the back slot and render on your character.

Using the bag

• Backpack — the root container. It has nine module slots, and every pouch lives in one of them.
• Radial menu (C by default) — opens the pouches and carried stations of the backpack you are wearing or holding, without opening the bag itself. It also opens while a station GUI is up.
• Backpack screen (B by default) — the full bag, the pouch settings and the filters.
• Pouches — storage, refill and bulk. Each one has its own filter, its own settings and its own auto-store switch, so the bag sorts pickups the way you set it up.

Features

Storage pouch

• Nine slots with a filter, set from a sample item instead of typing IDs (an ID search box is there for the awkward cases).
• Include or exclude mode: keep everything the samples match, or keep everything they do not.
• Per-pouch auto-store toggle and priority, so overlapping filters resolve the same way every time.

Refill pouch

• Refills the hotbar and the trade input slots from the items it stores.
• Rules per source, so a hotbar slot and a trade slot can pull from different places.
• Waits for a durability threshold before replacing a tool — by percentage or by absolute value.
• Replacement conditions can be combined with AND / OR and negated, and they are edited in game.
• Keeps working while its settings screen is open, and collected slots stay locked until you unlock them.

Bulk pouch

• Holds a single item type up to 4096, far past the normal stack limit.
• Left click takes one, right click takes a stack; the import and export sides are separate slots.

Pouch station

• A block that crafts every pouch (and the backpack) from the materials in your inventory — no crafting grid, no material slots. It lists the bills, shows held/needed per material, and greys out what you cannot afford yet.

Stations in the bag

• Crafting-related blocks can be carried in a module slot and opened from the radial menu: crafting table, furnace, smoker, blast furnace, brewing stand, anvil, smithing table, loom, cartography table, stonecutter and grindstone.
• The furnace family and the brewing stand keep their progress while the GUI is closed.
• The enchanting table is not supported.

Interface

• Artist-drawn widget skins with hover and press feedback, a help pane you can toggle on and off, and a settings window that floats above the bag instead of replacing it.

Crafting

Everything is made at the pouch station. The station itself is a normal crafting table recipe: three leather, two planks, one crafting table and three cobblestone.

The station bills are read from your inventory:

Compatibility

• Curios — the backpack can be worn in the back slot and renders on the player. Everything else works without it.
• Existing worlds keep working: the backpack was renamed from packingcube:large_bag to packingcube:backpack, and the old id is still resolved through a registry alias.

Status

0.1.0 is the first release. The mod is covered by 338 in-game tests (game test server) that run on every build.

License

MIT. See LICENSE.