Backpack Plus: Sophisticated Backpacks Addon
by Hakujoucho
With Sophisticated Backpacks: Addon, the inventory slot limits of Sophisticated Backpacks can be raised well above their defaults through a config file.
What it does
Sophisticated Backpacks caps a backpack at 144 inventory slots and 10 upgrade slots by default. This addon lets the server owner change those limits in the sophisticatedbackpacks-server.toml file, and the limit is no longer fixed at 144 once the change is made. A backpack can be configured to hold as many as 1,440 item slots. The addon is inspired by a Mixin-based addon from the Fool modpack that raised the same config limits for both inventory and upgrade slots.
To use it, the game must be launched once with the mod installed so the config file is generated. Changes to a backpack's inventory slot count apply only to backpacks obtained after the change, so existing backpacks keep their old size. The addon requires Sophisticated Backpacks and runs on the client and the server, so both sides need it. It is published for NeoForge 1.21.1 only, under All rights reserved, and is not open source.
Key features
Higher inventory slot cap
The inventory slot limit can be raised past the default 144 through the server config file.
Higher upgrade slot cap
The number of upgrade slots can also be raised above the default 10, using the same config file.
Large backpacks
Through configuration, a single backpack can reach as many as 1,440 item slots for very large storage.
Config-driven limits
The limits are set in sophisticatedbackpacks-server.toml, and the file appears after the game is launched once.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server owners and modpack builders who want larger Sophisticated Backpacks than the defaults allow, and players whose server has raised the limits in its config.
Questions
Does Sophisticated Backpacks Addon need Sophisticated Backpacks?
Does the server need the addon installed?
Do existing backpacks gain the new slots?
Which game versions are supported?
In the catalog
Backpack Plus: Sophisticated Backpacks Addon is one of 4,058 Storage mods on ModsFinder, and one of 1,794 Storage mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
Sophisticated Backpacks is a great mod, but even if you tweak the inventory slot count in its config file, it caps at 144 — which might not be enough for some players. Inspired by The Fool modpack, this addon uses Mixin to significantly raise the config limits for both inventory slots and upgrade slots. Now, you can…
Official listing
- Modrinth page
- modrinth.com/mod/backpackplus
- Owner
- Hakujoucho
- Published
- 2025-05-21
- Updated on Modrinth
- 2025-05-21
- Facts verified
- 2026-10-15