The B-Grip Travel Kit enables you to attach your B-Grip Camera Belt Grip not to a belt, but to a backpack strap. If you attempted that trick with the B-Grip quick-release system but without this Travel Kit, you'd have a horizontally oriented DSLR lens knocking against your swinging arm as you hike.
The Travel Kit allows you to attach the B-Grip and your camera to your backpack strap with the proper orientation: lens pointed down. Whether it's a backpack strap or another closed-circuit strap, the Travel Kit lets you mount the camera/lens/B-Grip parallel to the strap – rather than perpendicular, as you typically want with a belt (and as the B-Grip on its own enables).
By using the Travel Kit to mount it to your backpack strap, you can keep your B-Grip-mounted DSLR secured to your chest and ready to shoot.
Note! Requires separate purchase of B-Grip Camera Belt Grip – not included.