Aeronautics: Massbound
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on ModrinthMassbound is a lightweight mass system designed to make Minecraft physics more dynamic and consistent.
The mod assigns mass to items and vanilla entities and takes inventory contents into account when calculating their total mass. Containers and other inventory-holding blocks dynamically change their mass depending on what is stored inside them, while entities can become heavier based on the items they carry.
Massbound is designed as a general-purpose system rather than an addon tied to a specific vehicle, submarine, or gameplay concept, making it useful for physics-focused modpacks and other mods that need meaningful, dynamic mass values.
Features:
Mass values for vanilla items Mass values for vanilla entities Entity inventory weight Dynamic mass for blocks and containers with inventories Automatic recalculation when inventory contents change Support for modded inventories Designed for integration with physics-based mods
License: All Rights Reserved.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as aeronautics-cargo-weight-1.0.0.jar — drop this file into the mods folder
- Download size: 52 KB
- Download link checked 8 Oct 2026 — working
These come from our own check of the pack file, not from the source page.