I had a look now at finding a safety pack like the one in this thread so that I can attach it to the backplate
This is the closest I could find
Akona Safety Tube Hi-Viz Yellow
If I can get a safety sausage I can attach to the backplate I can give my girlfriend that other one to put in her BC or maybe give it back to the shop since it hasn't been opened yet
Gadget. Believe me. Keep it clean. If the smb is bigger than can fit in a pocket, mount it with bungee or a DR pocket under your plate. And, slow down.