A serious cyclist's secret weapon. The Stealth's slick fabrics, sleek aerodynamic shape, and unique drink tube routing combine to minimize drag. The uniquely shaped shoulder straps and wrist- or arm-mounted drink tube allow riders to drink while tucked in the aero position. Worn over or under a cycling jersey, the Stealth can be your secret to quicker times and more comfort.

• Internal 2-way Propulsion Harness
• 1.5 litre hydration bladder with filter-compatible screw-top closure and bite valve
• Rapid Access bladder compartment
• Lightweight, breathable Wall Mesh with soft perimeter binding that feels great against skin and won't damage technical apparel
• Air Scoop with ventilation channels
• Stretch sternum strap
• Aero Drink Tube (90-degree elbow, drink tube wrist/arm band)
• Bottom drink tube routing (left or right side) for shorter tubing lengths
• All straps can be tucked into the pack to eliminate drag
• Weight: 9.7 oz.

As comfortable as it is stylish, the Proton is great for multi-hour hiking, running and biking.

• 3-way Propulsion Harness
• 2 litre hydration bladder with filter-compatible screw-top closure and bite valve
• Twin external zippered pockets with dividers
• Tuck-away stretch waistbelt
• Vertically adjustable sternum strap
• Air Scoop with ventilation channels
• Airmesh moisture-wicking backing
• Insulated bladder compartment

A terrific day pack that provides plenty of fluid and gear-carrying capacity. Whether hiking or biking, enjoy the scenery un-distracted by pack discomfort - the Fusion works in harmony with your body.

• 3-way Propulsion Harness
• 3 litre hydration bladder with filter-compatible screw-top closure and bite valve
• Twin external zippered pockets with dividers
• Expanding rear quick stash pocket
• Tuck-away stretch waistbelt
• Vertically adjustable sternum strap
• Air Scoop with ventilation channels
• Airmesh moisture-wicking backing
• Insulated bladder compartment

Nathan's Human Propulsion Laboratories (HPL) conduct brutal product experiments with the help of dozens of top-level athletes. These HPL Experiments may be shooting for a world record or a new personal record - or perhaps a less tangible goal, like putting on an ultra or introducing ten road runners to the trails. Like all experiments, their progress toward achieving these goals with the help of Nathan products is tracked, studied, and reported. The Nathan HPL Series includes the products inspired by and named for their respective athletes.

The Wasatch 100 is one of the world's toughest hundred-mile trail runs. A lot of runners dream of finishing it "just once." Nathan's product testing critic, Dana "Mud n' Guts" Miller is shooting for 20 finishes. With 16 behind him, including 5 victories, he's discovered that a lightweight hydration vest can cut down on the nausea sometimes caused by a waist pack. The HPL #020 was designed to help Mud n' Guts survive another four Wasatch 100s. He suggests you use it on your next hundred-miler, whether it's your first or your 25th.

• 3-way Propulsion Harness
• 2 litre hydration bladder with filter-compatible screw-top closure and bite valve
• Twin front holsters for carbo-gel and/or GPS
• Two zippered rear compartments
• Zippered front pocket
• Lightweight, breathable Wall Mesh with soft perimeter binding
• Weight: 6 oz.