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By Michael Lanza

While sleeping bags have temperature ratings, with down jackets and other insulated jackets, there exists no easy way to determine how warm any specific garment will be without wearing it outside. But despite the absence of a precise metric for gauging the warmth of down and synthetic puffy jackets, there are ways to assess a specific jacket’s relative warmth before you even see it, using simple metrics. This article will explain how to do that.

Even though down and synthetic-insulation jackets don’t have ratings like sleeping bags (which, by the way, were not uniform for many years, though there is now a uniform bag-rating system; learn more in my “Pro Tips For Buying Sleeping Bags“), you can judge warmth using numbers easily available online. Over more than 25 years of testing and reviewing dozens of insulated jackets (and other gear and apparel), including the 10 years I spent as the lead gear reviewer for Backpacker magazine and even longer running this blog, I have found those indicators very reliable in helping me anticipate how warm at down jacket will be before I ever wear it.

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Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-guides to classic backpacking trips. Click here to learn how I can help you plan your next trip.

The Arc’teryx Cerium Hoody.
” data-image-caption=”The Arc’teryx Cerium Hoody in Aravaipa Canyon.
” data-medium-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?fit=300%2C192&ssl=1″ data-large-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?fit=900%2C576&ssl=1″ decoding=”async” width=”900″ height=”576″ src=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?resize=900%2C576&ssl=1″ alt=”The Arc’teryx Cerium Hoody.” class=”wp-image-58150″ srcset=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?w=1024&ssl=1 1024w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?resize=300%2C192&ssl=1 300w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?resize=768%2C491&ssl=1 768w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2023/04/Arcteryx-Cerium-Hoody-lead.jpg?resize=150%2C96&ssl=1 150w” sizes=”(max-width: 900px) 100vw, 900px” data-recalc-dims=”1″ />The Arc’teryx Cerium Hoody in Aravaipa Canyon.

The down fill weight is one way to tell, though it’s not strictly a measure of a jacket’s warmth—it’s only a measure of the total weight (in ounces or grams) of the down in the jacket. How much insulation is in the garment is obviously an important factor in warmth, but not the only one, because down comes in a range of quality ratings. And of course, various types of synthetic insulation have different weights and warmth-per-weight ratios.

The down fill rating (not to be confused with the down fill weight) is basically a quality metric, not an indicator of warmth. The fill rating refers to the volume, in cubic inches, that one ounce of that down fills; in other words, an ounce of 800-fill down will occupy 800 cubic inches of volume. Down feathers and other insulation keep you warm through trapping heat from your body in tiny air pockets within the insulation, so higher
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The Best Backpacking Gear for the John Muir Trail

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10 hours ago

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June 5, 2023

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By Michael Lanza

So you’re planning to thru-hike the John Muir Trail and making all of the necessary preparations, and now you’re wondering: What’s the best gear for a JMT hike? Having thru-hiked the JMT as well as taken numerous other backpacking trips all over the High Sierra—mostly between late August and late September, which I consider that the best time to walk the Sierra, to avoid snow and the voracious mosquitoes and blazing hot afternoons of mid-summer—I offer the following picks for the best lightweight backpacking gear and apparel for a JMT thru-hike.

Indisputably one of the best backpacking trips in America—and among the very best I’ve taken over three decades of backpacking, including 10 years I spent as Northwest Editor and lead gear reviewer for Backpacker magazine and even longer running this blog—the JMT meanders for 211 miles through the magnificent High Sierra, from Yosemite Valley to the summit of the highest peak in the Lower 48, 14,505-foot Mount Whitney (where backpackers must then descend another 11 miles to finish the trip at Whitney Portal trailhead). See my story about thru-hiking the JMT in seven days.

With few opportunities to resupply along the trail—and given the generally dry weather in the Sierra in summer—you can easily and should hike the JMT with the lightest gear that works for you (or that you can afford). Maximum pack weight will depend on how many days you spend on the trail and your food weight, but it’s quite feasible to keep your base pack weight (everything but food and water) within 15 pounds or less—and certainly no more than 20 pounds—without compromising safety or comfort in camp.

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Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-guides to classic backpacking trips. Click here to learn how I can help you plan your next trip.

A backpacker hiking the John Muir Trail above Helen Lake in Kings Canyon N.P., High Sierra.
” data-image-caption=”Marco Garofalo backpacking the John Muir Trail above Helen Lake in Kings Canyon N.P. Click photo to learn how I can help you plan your JMT thru-hike.
” data-medium-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2022/10/JMT2-085-Marco-Garofalo-hiking-above-Helen-Lake-John-Muir-Trail-Kings-Canyon-N.P.-High-Sierra..jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2022/10/JMT2-085-Marco-Garofalo-hiking-above-Helen-Lake-John-Muir-Trail-Kings-Canyon-N.P.-High-Sierra..jpg?fit=900%2C600&ssl=1″ decoding=”async” width=”900″ height=”600″ src=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2022/10/JMT2-085-Marco-Garofalo-hiking-above-Helen-Lake-John-Muir-Trail-Kings-Canyon-N.P.-High-Sierra..jpg?resize=900%2C600&ssl=1″ alt=”A backpacker hiking the John Muir Trail above Helen Lake in Kings Canyon N.P., High Sierra.” class=”wp-image-54840″ srcset=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2022/10/JMT2-085-Marco-Garofalo-hiking-above-Helen-Lake-John-Muir-Trail-Kings-Canyon-N.P.-High-Sierra..jpg?resize=1024%2C683&ssl=1 1024w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2022/10/JMT2-085-Marco-Garofalo-hiking-above-Helen-Lake-John-Muir-Trail-Kings-Canyon-N.P.-High-Sierra..jpg?resize=300%2C200&ssl=1 300w, https://i0.wp.com/thebigoutside
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CRS-28 Mission Control Audio

Published

11 hours ago

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June 5, 2023

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This is the vehicle trajectory and mission control audio without any additional commentary. There may be very long periods of silence. For our full hosted webcast, visit

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Photo Gallery: 36 Gorgeous Backcountry Lakes

Published

13 hours ago

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June 5, 2023

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By Michael Lanza

Water makes up about 60 percent of our bodies—and, I suspect, 100 percent of our hearts. We crave it not only physically, for survival, but emotionally, for spiritual rejuvenation. We love playing in it for hours as children and we paddle and swim in it as adults. We’re drawn by the calming effects of sitting beside a stream or lake in a beautiful natural setting, an experience that possesses a certain je ne sais quoi—a quality difficult to describe, but that we can all feel.

And nothing beats taking a swim in a gorgeous backcountry lake.

I’ve come across quite a few wonderful backcountry lakes over more than three decades of exploring wilderness—including about 10 years as the Northwest Editor of Backpacker magazine and even longer running this blog. I’ve just updated and expanded this list of my favorites to give you some eye candy as well as ideas for future adventures—and perhaps compare against your list of favorite backcountry lakes.

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Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-guides to classic backpacking trips. Click here to learn how I can help you plan your next trip.

Click on the links to my stories in these brief writeups to learn more about each of these trips. Much of this story is free for anyone to read, but reading the entire story requires a paid subscription. See my Custom Trip Planning page to learn how I can help you plan a trip to any of these lakes.

If you know some gorgeous lakes that are not on my list, please suggest them in the comments section below this story. I try to respond to all comments.

Here’s to your next peaceful moment beside a gorgeous lake deep in the mountains somewhere.

Elizabeth Lake in Glacier National Park.
” data-image-caption=”Early morning at Elizabeth Lake in Glacier National Park. Click photo to learn how I can help you plan your Glacier trip.
” data-medium-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?fit=900%2C600&ssl=1″ decoding=”async” width=”900″ height=”600″ src=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?resize=900%2C600&ssl=1″ alt=”Elizabeth Lake in Glacier National Park.” class=”wp-image-38774″ srcset=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?resize=1024%2C683&ssl=1 1024w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?resize=300%2C200&ssl=1 300w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?resize=768%2C512&ssl=1 768w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?resize=1080%2C720&ssl=1 1080w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/03/Gla6-018-Elizabeth-Lake-in-Glacier-National-Park.-2.jpg?w=1200&ssl=1 1200w” sizes=”(max-width: 900px) 100vw, 900px” data-recalc-dims=”1″ />Elizabeth Lake in Glacier National Park.

Elizabeth Lake, Glacier National
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