The Ambient VPAK-302 is a V-Mount Battery Power Distribution mod for the Sound Devices 302 mixer.
V-Lock battery mount, for two receiver and SD 302 mixer
The VPAK-302 mod ads a plate with two mounts for slot-in receivers and brackets to fix a Sound Devices 302 mixer to the VPAK II.
Versions for 552 and 664 are available, too.