
Modrinth · Minecraft mod
Server Backpacks!
A server-side backpacks mod that uses Polymer, with added GeyserMC support.
Quick answer
Which Server Backpacks! release should I use?
Server Backpacks! 1.6+26.3 targets 26.3 with Fabric. Do not install it on the client. It must be installed on the dedicated server. All 2 required mods have matching files.
Where it goes
Is Server Backpacks! required on the client, server, or both?
Do not install it on the client. It must be installed on the dedicated server.
This file is marked server-only.
What else does Server Backpacks! 1.6+26.3 need?
1.6+26.3. Change the file and its required mods may change too.
Install Fabric API, Polymer first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.
1 extra mod was pulled in by another dependency. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Server Backpacks! without breaking your instance.
Built for Server Backpacks! 1.6+26.3. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.6+26.3. It targets 26.3 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Fabric API, Polymer first. We found matching files for this game-version and loader setup. 1 comes through another mod in the chain.
- 03
Put it on the correct side
Do not install it on the client. It must be installed on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.6+26.3. It opens that exact file at the source.
About this project
What does Server Backpacks! add?
Overview
Trinkets, commands, and config are only supported in version 1.3 and above.
GeyserMC (Bedrock) support is only for the latest Minecraft versions supported by GeyserMC.
Before updating, it's recommended to check the changelog for breaking changes.
Additions
This mod adds 6 items.
- A small backpack, that has 9 slots.
- A medium backpack, that has 18 slots.
- A large backpack, that has 27 slots.
- A ender backpack, a backpack that lets you access your ender chest from anywhere!
- A global backpack, that has 54 slots and it's inventory can be shared by linking it with other global backpacks using an ender pearl by dropping 2 global backpacks on the ground plus an ender pearl!
- A lava backpack, that when full the backpack will clear the first row and move the second row to the first row. Essentialy a trash backpack.
Modules
- Currently, this mod adds:
- Crafting Module
- Stonecutter Module
- Void Module
- Vacuum Module
- Jukebox Module
To apply them to the backpack:
- Put the module and the backpack inside a smithing table.
To use them:
- Crafting Module: Sneak and open the backpack normally in the air, then you can click on the crafting module to open a crafting ui.
- Stonecutter Module: The same as the crafting module, but it shows the stonecutter ui.
- Void Module: You can add to it's filter by putting it inside a crafting table and add the items you want to filter around it. The backpack will void any nearby items you specified in the filter.
- Vacuum Module: The same as void module, but you can change it's mode to whitelist, blacklist or match backpack's content.
- Jukebox Module: To use it, first you need to integrate it with a backpack, and go inside the backpack's upgrade container GUI. To put the music disc, click the Jukebox Module while your mouse cursor is holding the music disc. Slowly change the mode as you can take it out if you click too fast.
It also adds an enchantment!
- Capacity, an enchantment that increases your backpack's storage by 9 additional slots per level! (Note: Can be applied on medium and large backpack only).
Also, Regular backpacks are dyeable like bundles!
1.3 and above
- Backpacks are like bundles. You can use the item form of a backpack to input item into it like a bundle. Backpacks only allows inserting item.
- Backpacks. backpacks. You can right click a backpack in a inventory to open it.
- Placeable backpacks.
Note: This below requires you have the Trinkets (Polymer Port) mod!
- You can put backpacks on a trinkets back slot. To open the backpack do /open.
- You also place it! Just shift right click on the ground with an empty hand.
Recipes











Commands
/backpacks:
/backpack backupMakes a backup./backpacks list: Lists created backpack instances./backpacks open <UUID>: Specify an UUID to open a backpack instance.
/backpacks open config :
/backpacks open config reset: Resets the backpack's config./backpacks open config reload: Saves the backpack's config./backpacks open config save: Reloads the backpack's config.
/open :
- Allows to open a backpack when it is equipped on the trinkets back slot.
Configuration
back_positions: Adjusts the backpack’s position on the player’s back.back_yaw: Controls horizontal rotation (left/right) of the backpack.back_pitch_when_sneaking: Alters the tilt angle of the backpack when the player is sneaking.
display_back: <default: true> Determines whether or not the backpack should be displayed on the back when equipped.breaks_with_flow<default: true> Determines whether or not the backpack should break when water flows to it.
types_of_backpacks: Add or remove an entry to remove or create a backpack.
Adding Textures
Write /polymer generate command.
Resource pack will be located in your server folder as polymer-resourcepack.zip or you can enable auto-host in polymer's config.
Geyser Support
Geyser is fully supported, but not when your wearing the backpacks. That is the only unsupported thing, but java players can fully see the backpacks on the back if you wear it.Example in game

Bugs
Please report
any bugs that might occur while using this mod.
Credits
- Octal for the orignal mod Server Backpacks as this is based on it.
- MOEJ-The-Good for the quality of life ideas.
- ndellagrotte for contributing the Lava Backpack.
Project description from Modrinth.
Pick your setup
Server Backpacks! by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.3
1 loader build26.2
1 loader build26.1.2
1 loader build26.1.1
1 loader build26.1
1 loader build1.21.11
1 loader build1.21.10
1 loader build1.21.9
1 loader build1.21.8
1 loader build1.21.7
1 loader build1.21.6
1 loader build1.21.5
1 loader buildShowing the newest 12 of 14 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Server Backpacks! versions and loaders
1.6+26.3
serverbackpacks-1.6+26.3.jar
15 Sept 2026
1.6+26.2
serverbackpacks-1.6+26.2.jar
19 Jun 2026
1.5.9+26.1
serverbackpacks-1.5.9+26.1.jar
12 Jun 2026
1.4.2+1.21.1
serverbackpacks-1.4.2+1.21.1.jar
10 Jun 2026
1.5.8+26.1
serverbackpacks-1.5.8+26.1.jar
10 Jun 2026
1.5.7+26.1
serverbackpacks-1.5.7+26.1.jar
4 Jun 2026
1.5.6+26.1
serverbackpacks-1.5.6+26.1.jar
27 May 2026
1.4.1+1.21.1
serverbackpacks-1.4.1+1.21.1.jar
18 May 2026
1.5.5+1.21.11
serverbackpacks-1.5.5+1.21.11.jar
15 May 2026
1.5.5+26.1
serverbackpacks-1.5.5+26.1.jar
15 May 2026
1.5.4+1.21.11
serverbackpacks-1.5.4+1.21.11.jar
10 May 2026
1.5.4+26.1
serverbackpacks-1.5.4+26.1.jar
10 May 2026
Looking for an older file? The official Modrinth project page is in Resources.