Installation
Add Backpack Gear as a dependency and mark it required in your loader metadata.
Loader dependency
Add the Backpack Gear jar to your development environment and declare it as a required dependency in your mod metadata.
Use the jar matching your loader and Minecraft version. Do not mix Fabric, Forge, and NeoForge jars.
Curse Maven
modImplementation "curse.maven:backpack-gear-1655799:8666965"Runtime
Players install Backpack Gear together with any mod that depends on its backpack slot/API.