Finally, while the inductance (equation (1)) depends on the period of the turns (w + s), the resistance (equation (5)) depends only on the line width w. Therefore, by increasing w relative to s, the resistance can be reduced even further. Two additional inductors, L3 and L4, were designed with w = 2s and large outer diameter, as shown in Table 1. These inductors were fabricated using 6 coats of Dupont 5064H, shown previously to give the highest performance. L3 had inductance of 4.720 ± 0.002 μH with resistance of 4.9 ± 0.1 Ω, while L4 had 7.839 ± 0.005 μH and 6.9 ± 0.1 Ω, in good agreement with the model predictions. This represents an improvement in the L/R ratio of more than an order of magnitude relative to the values in Fig. 1, due to the enhancements in thickness, conductivity, and w/s.

Our columnist Wes Siler tested the Tango Duo Slim in his comprehensive review of couple’s backpacking gear. The sleeping bag weighs in at 2.6 pounds and has a 30-degree temperature rating, making it ideal for three-season backpacking.

The I/O Mags were a highlight of our 2019 Winter Buyer’s Guide. Testers particularly loved the easy-to-use lens-swap tech, which relies on sturdy, hassle-free magnets to lock the glass in place.

At the time, we figured we were still young and didn’t have any major responsibilities or bills yet. None of us were married, or have kids, or mortgages, so we figured “Fuck it. Let’s give it our best shot.” We went all-in on our first office location (a 1,200-square-foot warehouse space with one office) in August 2008 in City of Industry, Calif.

We crowned this the Gear of the Year hiking shoe in our 2019 Summer Buyer’s Guide. They’re fully waterproof, and gave us confidence to power through puddles and light streams, thanks to the Gore-Tex construction. The cherry on top was the lightweight Vibram outsole, which kept our feet secure across uneven terrain.

With a cool-blue lens and tough stainless-steel body, the Salute gives you pilot aesthetics with a polarized carbonic TLT lens. It offers 100 percent UV protection and helps reduce glare from water and snow.

The shirt jacket is an essential layer for anyone living in colder climates. Built from the same cut as Patagonia’s iconic Fjord flannel, this shacket ramps up the warmth level thanks to a thin layer of polyester on the inside. Of course, on the outside, it still looks like your favorite flannel.

This tag features a variety of different locator technologies (two different microchips, a serial ID number, and QR Code) that airlines use all over the world to help identify lost luggage. It’s like microchipping your dog—if someone finds your luggage, they can scan the chip and get it back to you.

The Trail Mix 7 is built specifically to better fit around a woman’s bust. Compression straps that bring the load tighter to your back, reflective hits for 360-degree visibility, and seven liters of storage (in addition to the two-liter bladder) are icing on the cake.

The 21-liter Urban Assault bag is inspired by military assault rucksacks and is the epitome of clean, functional design. A unique three-zip closure on the front allows you to easily see the contents of your bag without having to dump it out. The face fabric is a super durable 500-denier Cordura, which you’ll be hard-pressed to tear.

The beauty of the Double Take: it’s only a cooler when you want it to be. Use the retro main shell on its own (choose from waxed canvas, 1,000-denier Cordura, or upcycled tent fabric when you buy), or throw the Chilly Bag insert in and you’ve got 6.5 liters of cold storage. Bonus points for the buckle that doubles as a bottle opener.

Strap this 1.5-inch-wide band around your ankle for an easy bit of reflectivity that’s more likely to catch a driver’s eye, thanks to the movement of your legs. The hook and loop closure is simple to use, and you can adjust it to be worn on a bare ankle or over your pants or tights.