I haven't tried this yet but found this in the Trinity Documentation
-TRK 3.3 is now volume label independent: you can put any volume label you like on your CD/USB stick. You just have to pass the volume label in your syslinux.cfg/isolinux.cfg by adding vollabel=YOURLABEL to the command line. Interesting for people making multiboot CDs.
Episode 5x24
in USB Multipass
Posted
I haven't tried this yet but found this in the Trinity Documentation
Link