MIMESIS - InventoryExpansion

🛟 Need help or found a bug? Get support at support.doodesch.de/inventoryexpansion.

Adds extra backpack slots beneath the inventory HUD. Press C to raise the hotbar and reveal them, using the game's own slot frames and key hint. Carry more loot without permanently cluttering the standard 4-slot hotbar. Standalone, no MimicAPI required.

Features

• Adds 4, 9, or 16 usable inventory slots and preserves the native cosmetic and equipment slots. Carried bags add their normal capacity bonus.
• Toggle between the standard hotbar and the backpack with a configurable key (default C); the mod reads the key live each frame.
• Opening raises only the inventory HUD, including equipment and weight. The backpack sits below it with native slot artwork, a faint backing and small side marks.
• Rows have at most 8 slots and stay centered and balanced: 9 slots use 5+4, 12 use 6+6, 14 use 7+7, and 18 use 6+6+6.
• A small native key badge at the bottom shows the configured toggle key.
• While open, slot cycling affects backpack slots. While closed, it follows the visible native hotbar, cosmetic and equipment 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 items - the native inventory HUD moves up above the backpack.

Nine slots - two centered rows of 5 and 4.

Sixteen slots - two rows of 8.

Closed - the hotbar returns to its original height and the small key hint remains.

Requirements

Component	Version
MIMESIS	0.4.0
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 is 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.

Configuration

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

The host controls Enabled, AdditionalSlots, ReduceMovementSpeed, FillBackpackFirst, and BlockLargeItemsInBackpack for the lobby. Joining clients use those values automatically without changing their local config. BackpackKey, SelectBackpackSlotOnOpen, and RestoreStandardSlotOnClose stay local. A host without InventoryExpansion uses native inventory capacity and no mod backpack. Shared-setting changes apply to the next lobby.

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. Rows are balanced with at most 8 slots each. 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 raise the inventory HUD and reveal the backpack underneath. Press it again to close the backpack and restore the original HUD height.
• When the backpack is open, slot scrolling and selection cycle through its slots. When closed, native visible hotbar, cosmetic and equipment slots remain available.
• 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. Clients automatically use the host's slot count and gameplay 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 0.4.0 / MelonLoader 0.7.3.