Sophisticated Backpacks - MT Inventory Weight
by MEGATREX4
Sophisticated Backpacks Inventory Weight is a Fabric add-on that makes MT Inventory Weight count the real contents of Sophisticated Backpacks backpacks.
What it does
A built-in calculator in MT Inventory Weight handles backpacks by reading the container's NBT data. Sophisticated Backpacks stores its real contents elsewhere, in a world-level BackpackStorage, so the generic reader under-counts or miscounts those backpacks. Everything else falls through to the defaults.
The provider resolves each backpack's UUID to its stored contents through the Sophisticated Backpacks wrapper API, so backpacks that are equipped, held or stored are weighed correctly. Nested backpacks are followed with a depth limit to avoid runaway recursion. The result's base weight shows the full, undivided contents weight. The base weight for an empty backpack comes from one fixed constant, SophisticatedBackpacksInventoryWeight EMPTY BACKPACK WEIGHT, and server owners can set it through a config value.
The mod needs Fabric API, MT Inventory Weight and the unofficial Fabric port of Sophisticated Backpacks. It is published for Fabric only, across 1.20.1, 1.20.4 and 1.21.1, and the environment is client and server. When Sophisticated Backpacks is present but its provider is not active, the game logs a warning and Inventory Weight reverts to default handling.
Key features
Accurate backpack weight
Backpacks are weighed from their real stored contents instead of the generic container NBT reader.
Nested backpack handling
Backpacks placed inside other backpacks are counted, with a depth limit that prevents endless recursion.
Configurable empty weight
The base weight of an empty backpack is a single constant that can be exposed as a user-configurable setting.
Full contents display
The base weight of the result includes the whole contents weight of the backpack, without being split up.
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 3
How it compares
Lock & Order is a Fabric mod for 1.20.1 – 1.21.1 that is not open source and is released under All rights reserved, running on client and server. Sophisticated Storage in Motion (Unofficial Fabric port) is open source under the GNU General Public License v3.0 only, for the same versions and environment. StorageBlock - BlockBlock addon is open source under the MIT License, for 1.20.1 only, and it is optional on either side.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Sophisticated Backpacks - MT Inventory Weight | Fabric | 1.20.1 – 1.21.1 | Client and server | 2026-06-15 |
| Lock & Order | Fabric | 1.20.1 – 1.21.1 | Client and server | 2026-03-01 |
| Sophisticated Storage in Motion (Unofficial Fabric port) | Fabric | 1.20.1 – 1.21.1 | Client and server | 2025-04-21 |
| StorageBlock - BlockBlock addon | Fabric | 1.20.1 | Client or server, optional | 2024-09-10 |
Questions
Does Sophisticated Backpacks Inventory Weight need Fabric API?
Does the server need this mod?
Which game versions does the add-on support?
In the catalog
Sophisticated Backpacks - MT Inventory Weight is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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What the author says
Accurate MT Inventory Weight support for Sophisticated Backpacks (Unofficial Fabric port). MT Inventory Weight ships a generic backpack calculator that reads container NBT, but Sophisticated Backpacks assigns each backpack a UUID and stores its real contents in world BackpackStorage (PersistentState) — not always in…
Official listing
- Modrinth page
- modrinth.com/mod/sb-inventoryweight
- Owner
- MEGATREX4
- Published
- 2026-06-15
- Updated on Modrinth
- 2026-06-15
- Facts verified
- 2026-10-15