Whatever happened to the black leather fanny packs from the 80s? Oh, that's right, we turned them around, tricked them out and now we call them lumbar packs. Like hair bands and Vanilla Ice, that just proves that you can't keep a good idea down, and Black Diamond serves up a nice model with the Fuse.
The Fuse is a speedy little number, weighing in at 8oz. Dual water bottle pockets suitable for 20oz bottles or smaller have two straps each to adjust fit so your hydration doesn't end up on the trail. They even tuck away into a tunnel between the main pack and the waist belt. The waist belt has a zipped pocket on each side for nibbles, and the main pack has a smaller zipped pocket inside with a key clip.
The Fuse is a great minimalist pack for trail runners and fast hikers. The large paddle shaped hip belt is comfortable, and the mesh lining does a decent job of managing sweat, at least to the point that it doesn't slide around too much on bare skin. A nice touch is the dual side pulls to tighten the waist belt. It's just big enough to store a light shell jacket and snacks, and with two bottle pockets you can use one for water and one for bear spray if you need to. The Fuse does the job and won't slow you down.