Out of all the assisted-braking belay devices and carabiners Edelrid's Mega Jul Belay Kit is probably the most practical option for multi-pitches and alpine approaches especially if there are rappels involved. Most assisted-braking devices only allow one strand of the climbing rope and out of the rest this Mega Jul is one of the lightest and most compact. The Mega Jul's clever design pinches the rope tight when it rushes through the device too quickly and the thumb helps you regulate the brake's friction. Nothing wears out carabiners like a lot of rappelling which is why Edelrid integrated a steel insert in the HMS Bulletproof Screw FG Locking Carabiner for longer lasting durability. There's also a retainer to keep the harness and belay device properly oriented while you belay.