MIMESIS - InventoryExpansion

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Adds extra backpack inventory slots you toggle on demand with a configurable key, shown in a custom animated panel that slides in and out. Carry more loot without permanently cluttering the standard 4-slot hotbar. Standalone, no MimicAPI required.

Features

• Adds 4, 9, or 16 extra inventory slots laid out as a square grid (2x2, 3x3, or 4x4); the count is configurable. The new slots are real, usable inventory, not just a visual overlay.
• Toggle between the standard hotbar and the backpack with a configurable key (default C); the mod reads the key live each frame.
• Extra slots render in a custom backpack UI panel that uses the bundled sprite and slides in and out with a short eased animation. If the image is missing it falls back to a translucent black panel.
• Shows a visual key hint on the panel displaying the currently configured toggle key.
• Context-aware slot scrolling: while the backpack is open, slot cycling affects only the backpack slots; while it is closed, it affects only the standard 4 slots.
• Cursor handoff on toggle: opening the backpack moves your selection to the first backpack slot, and closing it returns the selection to the standard inventory, so the cursor never stays stuck on a hidden slot. Each direction is configurable.
• Optional backpack-first pickup: while the backpack is open, items you pick up fill the backpack slots before the standard inventory (host / single-player only).
• Optional movement-speed reduction to 50% while the backpack is fully open, restored automatically when it closes.
• Automatically hides the panel during loading screens and map changes, and when you leave the game or return to the title screen.

Screenshots

Open with loot - the extra backpack slots hold real items.

Toggle with a key (default C).

Configurable grid sizes (AdditionalSlots) and the resting peek state with the key hint.

Requirements

Dependency: LavaGang-MelonLoader-0.7.3.

Installation

Recommended: Thunderstore mod manager

Install through a Thunderstore mod manager such as r2modman or Gale. The MelonLoader dependency and the backpack asset are handled automatically.

Manual

1. Install MelonLoader 0.7.3 into MIMESIS.
2. Download this package and place InventoryExpansion.dll into MIMESIS/Mods/.
3. Place the bundled Backpack.png at MIMESIS/Mods/Assets/Backpack.png (an Assets subfolder next to the DLL). Without it the panel still works but renders as a plain translucent box.
4. Launch the game once to generate the configuration file at UserData/MelonPreferences.cfg.

Configuration

Stored in UserData/MelonPreferences.cfg under the [InventoryExpansion] category. You can also edit these through a MelonPreferences UI.

Usage

• Press the configured toggle key (default C) to slide the backpack panel in and out. The panel sits at the bottom-right of the screen and shows a key hint.
• When the backpack is open, slot scrolling and selection cycle only the backpack slots; when it is closed, they cycle only the standard 4 hotbar slots.
• Opening the backpack jumps your selection to the first backpack slot; closing it returns the selection to your previous standard slot, so the cursor is never stuck on a hidden slot (toggle each via SelectBackpackSlotOnOpen / RestoreStandardSlotOnClose).
• With FillBackpackFirst on, items you pick up while the backpack is open go into backpack slots first. This changes server-side placement, so it only applies when you host or play single-player.
• With ReduceMovementSpeed on, you move at 50% speed while the backpack is fully open, and full speed is restored when it closes.
• The panel auto-hides during loading screens and map changes, and when you leave the game or return to the title screen.

Source code and issues: github.com/DooDesch/Mimesis-InventoryExpansion.

Changelog

All notable changes to InventoryExpansion are documented in this file. The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[1.4.4] - 2026-06-23

Fixed

• The backpack image shows up again after installing from Thunderstore or Nexus. The release packages did not include Backpack.png, so the backpack panel had no image. The image is now bundled inside the mod itself, so no separate file is needed. You can still override it by placing your own Backpack.png in an "Assets" folder next to the mod DLL.

[1.4.3] - 2026-06-23

Fixed

• Multiplayer: fixed a backpack pickup issue that could make items appear duplicated on clients. The backpack-first pickup runs on the host for every player, but was decided from the local backpack state, so another player's pickup could be redirected based on the host's backpack. It now only applies to your own inventory.

Added

• Large items (the ones you cannot switch away from while holding them, such as two-handed items) can no longer be picked up into the backpack while it is open; a short message is shown instead.
• The backpack can no longer be opened while you are holding a large item.
• New "Block Large Items In Backpack" setting (on by default) controls both of the above. Disable it to allow large items in the backpack again.

[1.4.2] - 2026-06-22

Fixed

• The mod's Harmony patches were applied twice (MelonLoader auto-applies them, and the mod also called PatchAll() itself), so every patch ran twice. The redundant call was removed; patches now apply exactly once.

[1.4.1] - 2026-06-17

Changed

• Started maintaining a full changelog that is now published on GitHub, Thunderstore and Nexus. No gameplay changes compared to 1.4.0.

[1.4.0] - 2026-06-15

Added

• Configurable cursor handoff so the mouse cursor behaves predictably when the backpack is open.
• Backpack-first pickup: picked-up items now go into the backpack slots first.

Fixed

• Corrected the position of durability and stack-count labels on backpack slots.
• Fixed the slot label offset by scaling slots through their local scale, so labels line up at every grid size.

[1.3.1] - 2026-06-15

Fixed

• Compatibility with the Mimesis 0.3.0 game update (avatar detection now resolves again on the new game build).
• The backpack is now hidden during loading screens.
• Fixed the backpack panel breaking after a map change.

Changed

• Pinned the MelonLoader dependency to 0.7.3.
• Refreshed the README with structured content, badges, and detailed configuration options.

[1.1.0] - 2025-11-17

Added

• Movement speed is now reduced while the backpack is open.
• Backpack visibility now respects the game's pause state, and the key hint text was improved.

[1.0.0] - 2025-11-16

Added

• Initial release. Expand your inventory with additional backpack slots and toggle between the standard inventory and the backpack with a configurable key. Includes the backpack image, UI layout, and inventory slot selection handling.