Modrinth · Minecraft mod
Colossal Chests
For when regular chests are too small
Quick answer
Which Colossal Chests release should I use?
Colossal Chests 1.21.1-1.9.0 targets 1.21.1 with NeoForge. Installation on the client is optional. Installation on the dedicated server is optional. All 1 required mods have matching files.
Where it goes
Is Colossal Chests required on the client, server, or both?
Installation on the client is optional. Installation on the dedicated server is optional.
The source marks this as usable on both the client and server.
What else does Colossal Chests 1.21.1-1.9.0 need?
1.21.1-1.9.0. Change the file and its required mods may change too.
Install Cyclops Core first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Colossal Chests without breaking your instance.
Built for Colossal Chests 1.21.1-1.9.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.21.1-1.9.0. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Cyclops Core first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
Installation on the client is optional. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.21.1-1.9.0. It opens that exact file at the source.
About this project
What does Colossal Chests add?
Sometimes, regular chests are just too small, this mod allows you to create multiblock chests of any size. (The maximum size can be changed in the config file)

Mod Spotlights:
To build these chests, you will need multiple Colossal Chest Wall blocks and exactly one Colossal Chest Core block.
This Core block will contain the actual items of the multiblock, so break that one, and all items will pop out.


Your structure must be cubic, each side must have an equal length. The minimum size of the structure is two blocks.
The structure must be made up of Chest Wall's, exactly one Colossal Chest Core block must be present in the structure.
Once your structure is valid, the multiblock will be formed visually.

You must only build the actual walls of the structure, leave the inside of the structure hollow.

You can attach hoppers and pipes to the chest at the position of the Colossal Chest Core block.

Obviously, you can also open a gui to manage the inventory of the chest yourself.

Optionally, you can add any number of Colossal Chest Interface blocks to your structure to make those spots interfacable with hoppers and pipes.
Next to the wood chests, variants for all types of metals (including obsidian) also exist, just like with the Iron Chest mod.
When the Iron Chest mod is detected, those chest textures are used, otherwise the internal textures are used (this can be disabled).
If you have enough with wooden chests, these metal variants can be disabled easily.


The Obsidian Colossal Chest is an upgraded version of the Diamon Colossal Chest, which has the same content size, but can not explode. The wall can be crafted by surrounding a diamond chest wall with eight obsidian blocks in a crafting grid.


The Upgrade and Downgrade tools can be used to up/downgrade a chest to the next/previous tier without having to break and replace all blocks. This requires you to have all required blocks of a next/previous tier in your inventory, and this tool will automatically replace the chest with the corresponding material, while maintaining its inventory.
Note that the Downgrade tool can make inventories smaller, so items may pop out if your inventory becomes too small for the new material.
If you are having trouble with your chest not forming, you can right-click with an empty hand on the incomplete structure to see why it won't form.

Formula for number of slots = ceil((diameter ^ 3) * 27 * material_factor)
Material factors:
- Wood: 1
- Copper: 1.666
- Iron: 2
- Silver: 2.666
- Gold: 3
- Diamond: 4
- Obsidian: 4
And finally, the most colossal chest of 'em all! (Crafted with a Chest Wall and a Wood Plank)

This mod collects anonymized startup data, this can be disabled in the config file and adheres to Minecraft's snooper settings.
Support us via the referral code cyclops when renting a Bisect Hosting server, and get 25% off!
Project description from Modrinth.
Pick your setup
Colossal Chests by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
4 loader builds26.1.2
4 loader builds26.1.1
4 loader builds1.21.11
4 loader builds1.21.1
4 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Colossal Chests versions and loaders
1.21.1-1.9.0
colossalchests-1.21.1-neoforge-1.9.0.jar
27 Aug 2026
1.21.1-1.9.0
colossalchests-1.21.1-fabric-1.9.0.jar
27 Aug 2026
1.21.1-1.9.0
colossalchests-1.21.1-forge-1.9.0.jar
27 Aug 2026
26.2-1.8.16-288
colossalchests-26.2-neoforge-1.8.16-288.jar
27 Aug 2026
26.2-1.8.16-288
colossalchests-26.2-forge-1.8.16-288.jar
27 Aug 2026
26.2-1.8.16-288
colossalchests-26.2-fabric-1.8.16-288.jar
27 Aug 2026
26.1.2-1.9.0
colossalchests-26.1.2-neoforge-1.9.0.jar
27 Aug 2026
26.1.2-1.9.0
colossalchests-26.1.2-forge-1.9.0.jar
27 Aug 2026
26.1.2-1.9.0
colossalchests-26.1.2-fabric-1.9.0.jar
27 Aug 2026
26.1.2-1.8.16-283
colossalchests-26.1.2-fabric-1.8.16-283.jar
27 Aug 2026
26.1.2-1.8.16-283
colossalchests-26.1.2-neoforge-1.8.16-283.jar
27 Aug 2026
26.1.2-1.8.16-283
colossalchests-26.1.2-forge-1.8.16-283.jar
27 Aug 2026
Looking for an older file? The official Modrinth project page is in Resources.