Key takeaways

• The Nitecore NB Air is is available now for$37.
• Weighing just 3.14 ounces, it's the lightest power bank I've tested.
• There's no USB-C cable or pouch included with the power bank.

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For hikers and runners, every ounce you're carrying counts. Power banks can be a big challenge because you need something powerful enough to charge your devices, but still lightweight and compact enough to take with you. 

Also: The best power banks you can buy

This is where theNitecore NB Air comes into play-a power bank the company describes as a "waterproof, competition-grade energy bar." Nitecore is known for its innovative power banks, such as the NB10000, which combines thin batteries, a polymer chassis, and carbon fiber to create a lightweight solution for those on the move. But the NB Air takes the concept of thin and light to an entirely new level. 

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Nitecore NB Air

The Nitecore NB Air is. 5,000mAh power bank that's been designed to be thin and light yet tough.

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The NB Air is a 5,000mAh/19.4Wh power bank featuring a single 18W input/output USB-C port that supports two-way Power Delivery (PD) and Quick Charge (QC) 3.0. All of this is packed into a sleek bar measuring 4.4 x 1.9 x 0.38 inches (112 x 48 x 9.7 mm) and weighing just 3.14 oz (89 g), resulting in an impressive energy density of 310 mWh/g.

This remarkable efficiency is achieved through a lightweight composite frame and carbon fiber shell that weighs only 0.49 oz (13.8 g). Despite its lightweight design, the exterior is robust, built to withstand torsion, and is rated IPX7 for dust and water resistance -- fully dustproof and capable of withstanding immersion in water up to one meter for 30 minutes. The rounded corners of the shell are specifically designed to absorb impact forces and prevent damage to the fabric of coats or rucksacks. 

On one end, you'll find a USB-C port, a four-LED power level indicator, and a capacitive button to illuminate the power level indicator. The power bank is engineered to perform in a wide range of environments, operating effectively between 14