REI Flash 45 backpack review

A backpacker hiking the Dawson Pass Trail above Pitamakan Pass in Glacier National Park.

The Best Ultralight Backpacks of 2024

By Michael Lanza

Do you need an ultralight backpack? Many backpackers might answer “no” when, for many reasons, their answer should logically be “yes.” These packs aren’t just for thru-hikers. Typically weighing roughly between under two pounds and three pounds empty, ultralight packs have support for carrying 25 to 35 pounds—making them ideal for more than just ultralight backpacking. For many backpackers, that represents the range of pack weight they either carry on most trips—or could carry on most trips, with smart packing and reasonably light gear.

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The REI Flash 45 in Utah's Dark Canyon Wilderness.

Gear Review: REI Flash 45 Backpack

Backpack
REI Flash 45
$159, 47L/2,868 c.i., 2 lbs. 14 oz. (large)
Sizes: men’s medium (45L/2,746 c.i.) and large, women’s small (45L/2,745 c.i.) and medium (47L/2,868 c.i.)
rei.com

The challenge: Backpack a three-day, 40-mile loop in Utah’s Dark Canyon Wilderness, staying as light as possible, but having a pack capable of hauling extra water without compressing my spine. It struck me as a good opportunity to test out REI’s latest iteration of the Flash 45 backpack. Having used and reviewed the previous version of the Flash 45, I was curious to hike with this newly updated sack—which has gained about 10 ounces compared to eight years ago (not bad, compared to most people), but also appeared capable of handling more weight comfortably than its predecessor. I discovered that much is true, and that’s among a few improvements to a backpack that’s still under three pounds and, more remarkably, under $150.

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Trekkers outside a teahouse on Nepal's Annapurna Circuit.

Ask Me: What Pack Do You Recommend for Hut Treks?

Hi Michael,

Hope all is well. I’m looking for your opinion on a 30-liter pack. I am going to Nepal in October on a 15-day trek. I think this would be the perfect size for me, because also I like a little bigger daypack for my hikes in the White Mountains. I have an older Gregory Z30, and I just tried on the new one and like the new details, plus I sweat really badly on hikes. As always thank you in advance, and I look forward to hearing from you.

Mike
Everett, MA

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Gear Review: REI Flash 45 Backpack

REI Flash 45
REI Flash 45

NOTE: Click here to read my review of the newer, 2017 version of the REI Flash 45 backpack.

Backpack
REI Flash 45
$129, 45L/2,745 c.i., 2 lbs. 3 oz. (men’s medium)
Sizes: medium (fits torsos 17-19 inches) and large (50L/3,051 c.i., 2 lbs. 4 oz., fits torsos 19-21 inches)
rei.com

For most backpacking trips, when I’m not carrying gear and food for my family, I pack as light as possible and walk long days: I like to see as much wilderness as I can. For those trips, I prefer a backpack that’s light but still has decent support; I find that the virtually frameless ultralight packs with minimal support pull on my shoulders too much over the course of a 10- or 12-hour day of hiking. On a recent three-day, 65-mile hike in Yosemite, carrying a max of about 25 pounds, the Flash 45 hit that nice middle ground: lightweight, yet comfortable with the amount of weight I threw into it, and very functional.

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