Bind geometry to body

[dapper swallow]

I'm trying to make a custom backpack model permanently attached to the player. (it's not an attachable) How do I bind it to the player's body like a cape would?

[rustic cairn]

I'd suggest to add an additional render_controller in RP/entities/player.entity.json
That way it allows to render additionally added (same file) geo and texture. You should look how the cape is build into the same file.
To bind it, just recreate the bone structure of the player as far as necessary: root->waist->body->"backpack,etc"

(geometry)