ultralight backpack reviews

A backpacker above Macon Lake and Washakie Lake in the Wind River Range, Wyoming.

The Best Backpacking Gear of 2026

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By Michael Lanza

The Wind River Range, Idaho’s Sawtooth Mountains, and the Grand Canyon (all numerous times now). The John Muir Trail. Glacier National Park and the Tetons. The Canadian Rockies. Southern Utah’s Owl and Fish canyons, Buckskin Gulch, and Paria Canyon. Utah’s High Uintas Wilderness, Montana’s Beartooths, and Colorado’s Weminuche. New Hampshire’s Presidential Range. Iceland’s Laugavegur and Fimmvörðuháls trails and New Zealand’s Milford Track, Routeburn Track, and Tongariro Alpine Crossing.

These are just some of the places where I’ve recently tested the backpacking gear and apparel that I’ve reviewed at The Big Outside—so that I can give you honest and thorough, field-tested opinions that help you find the best gear for your adventures.

And that’s exactly how I came up with the following picks for today’s best backpacking gear.

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The Deuter Aircontact Ultra 50+5 ultralight backpack.

Review: Deuter Aircontact Ultra 50+5 Backpack

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Ultralight Backpacks
Deuter Aircontact Ultra 50+5
$295, 55L/3,356 c.i., 2 lbs. 15 oz./1.33kg
One adjustable size
Aircontact Ultra 50+5: backcountry.com

To put Deuter’s updated-for-2024 Aircontact Ultra 50+5 ultralight backpack through the paces, I took it on a pair of quite rugged but also quite different backpacking trips this spring: a three-day hike through southern Utah’s Owl and Fish canyons with a max weight of about 30 pounds in the pack, and six days and about 60 miles backpacking the Grand Canyon’s Gems Route, repeatedly carrying extra water—and starting out with more than 40 pounds inside, including over 10 pounds of water and 11 pounds of food. As I expected, those trips revealed much about the Aircontact Ultra backpack and why they might appeal to lightweight and ultralight backpackers.

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The Deuter Aircontact Ultra 45+5 SL backpack.

Review: Deuter Aircontact Ultra 50+5 and 45+5 SL Backpacks

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NOTE: See my review of the updated-for-2024 versions of the Deuter Aircontact Ultra 50+5 and 45+5 SL backpacks.

Ultralight Backpack
Deuter Aircontact Ultra 50+5
$295, 55L/3,356 c.i., 2 lbs. 11 oz./1.2kg
Deuter Aircontact Ultra 45+5 SL
$250, 50L/3,051 c.i., 2 lbs. 11 oz./1219g
One adjustable size in both models
Aircontact Ultra 50+5: backcountry.com
Aircontact Ultra 45+5: backcountry.com

Many mid-size, lightweight and ultralight backpacking packs share more similarities than differences—because the design details they share have proven popular and work. Still, Deuter’s Aircontact Ultra 50+5 and 45+5 SL distinguish themselves from some competitors for their adjustable, comfortable fit and smart design details that make a difference in your experience carrying it, as I found using the Aircontact Ultra 45+5 SL on a five-day, late-summer backpacking trip in the Wind River Range and a three-day hike on the 22-mile Boulder Mail Trail-Death Hollow Loop in the Grand Staircase-Escalante National Monument in early October.

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The Mountainsmith Zerk 40 ultralight backpack.

Review: Mountainsmith Zerk 40 Ultralight Backpack

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Ultralight Backpack
Mountainsmith Zerk 40
$220, 40 liters/2,440 c.i., 1 lb. 13 oz./822g (including removable accessories)
One unisex size, fits torsos 16-19 inches
backcountry.com

Within the rather exclusive category of ultralight backpacks weighing two pounds or less, one sees similarities, most commonly and conspicuously a frameless, roll-top design with large external pockets. The Mountainsmith Zerk 40 takes that template and juices it with some smart details and add-ons, tougher materials, and a touch of modularity while keeping it significantly under two pounds. That suited my needs quite well trekking hut to hut for six days on Iceland’s Laugavegur and Fimmvörðuháls trails—and I think much about the Zerk will also appeal to many ultralighters and thru-hikers.  

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The Osprey Exos 58 ultralight backpack.

Review: Osprey Exos 58 and Eja 58 Ultralight Backpacks

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Ultralight Backpack
Osprey Exos 58 and Eja 58
$285, 58L/3,539 c.i., 2 lbs. 14 oz./1.3kg (men’s medium)
Sizes: men’s S/M and L/XL, women’s XS/X and M/L
Exos: backcountry.com
Eja: osprey.com

Osprey’s men’s Exos and women’s Eja packs would seem like shining examples of gear proven to perform so well for so long that redesigning them risks customer backlash. As a longtime fan of the packs, I was eager to take the Exos 58 on a long cruise—nine days and nearly 130 miles through the High Sierra in August, mostly on the John Muir Trail with some on- and off-trail detours. I came away from that walk convinced that, with what they changed and what they kept in the Exos/Eja, Osprey done made these packs even better.

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