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 embedded sprite and slides in and out with a short eased animation. If the image cannot load 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.
• Blocks large items from entering the open backpack and prevents opening it while holding one; configurable through BlockLargeItemsInBackpack.
• 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

Component	Version
MIMESIS	0.3.2
MelonLoader	0.7.3+

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. Launch the game once to generate the configuration file at UserData/MelonPreferences.cfg.

The backpack image is embedded in the DLL. To use your own image, place it at MIMESIS/Mods/Assets/Backpack.png.

Configuration

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

Option	Description	Default	Values/Range
Enabled	Enable InventoryExpansion functionality. When disabled, the mod will not modify game behavior.	true	true / false
AdditionalSlots	Number of extra inventory slots to add on top of the game's default inventory size. Valid values: 4, 9, or 16 (square grids 2x2, 3x3, 4x4). Other values are rounded to the nearest valid option.	4	4, 9, or 16
BackpackKey	Key to toggle backpack visibility. Press to switch between standard inventory and backpack.	C	A UnityEngine.KeyCode name that is also supported by the Unity Input System. Invalid or empty values fall back to C.
ReduceMovementSpeed	When enabled, player movement speed is reduced to 50% while the backpack is fully open.	true	true / false
SelectBackpackSlotOnOpen	When opening the backpack, move the selected slot to the first backpack slot.	true	true / false
RestoreStandardSlotOnClose	When closing the backpack, return the selected slot to the standard inventory (the slot selected before opening).	true	true / false
FillBackpackFirst	While the backpack is open, picked-up items fill the backpack slots before the standard inventory. Host / single-player only.	true	true / false
BlockLargeItemsInBackpack	Block large items from entering the open backpack and prevent opening it while holding one.	true	true / false

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.

In multiplayer, install the mod on the host and clients using the extra slots, with matching AdditionalSlots settings. Backpack-first pickup applies to the host's own inventory.

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

AI disclosure

The mod icon is AI-generated.

Built against MIMESIS 0.3.2 / MelonLoader 0.7.3.