The REI Flash 18 is a sort of in-between bag that's light and packable enough you can bring it in your luggage but has a lot more features than ultralight options. As a small, top-loading bag without a weight-bearing hip belt, it's not meant for long day hikes with heavy loads but is a good option for shorter hikes around home, heading to the gym, or as a day bag on a longer backpacking trip. If 18 liters isn't enough for you, the Flash is also available in a 22-liter size. Still not enough capacity for your liking? The Cotopaxi Luzon 24L is a similar bag that's a bit larger and with features, we found rather conducive to the variety of travel.
REI Co-op Flash 18 Review
A good, grab-and-go bag for smaller users, but not ideal for long hikes or heavy loads.
Price: $40 List | $39.95 at REI
Pros: Lightweight, useful features, flap to cover cinch top, inexpensive
Cons: Small fit, hip belt not load-bearing
Manufacturer: REI Co-op
Cons: Small fit, hip belt not load-bearing
Manufacturer: REI Co-op
By Maggie Brandenburg ⋅ Senior Review Editor ⋅ May 14, 2019
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Our Verdict
Compare to Similar Products
Our Analysis and Test Results
The REI Co-op Flash 18 is the lightest, non-ultralight pack we tested, at just 9 ounces. It's made of ripstop nylon and features a top-loading cinch top design with a removable back pad.
Performance Comparison
Exploring an unexpected trail in Iceland with the REI Flash 18.
Comfort
The Flash has a thin, removable back panel that helps protect your back from the edges and hard surfaces of your gear a bit. While it's nothing like the super comfy padding of the CamelBack Sequoia 22, our Editor's Choice award winner, it's a marked improvement over the paper-thin construction of ultralight models like the Osprey Ultralight Stuff Pack and Sea to Summit Ultra-Sil. It can also double as a sit pad when you want to take a break or have reached your destination. The shoulder straps aren't padded but do have some very light internal support as well as a design that takes the seam away from the insides of the straps, thereby alleviating some of those pressure points. The Flash also has a webbing hip belt for stabilization and a sternum strap, both of which can be removed.
Fold-over seams help keep pressure points away from your neck.
Versatility
The Flash has a good amount of pretty useful features that we think make this pack versatile beyond just a short day hike. A single exterior zippered pocket, several interior organizational pockets, and a key clip are handy for just about any adventure. This bag is also hydration compatible, with a dedicated pouch, loop, and hole at the top. There's also a daisy chain and ice axe loop for attaching gear that can't quite fit inside, as well as an emergency whistle on the sternum clip. Our favorite feature for this particular bag, is the small flap that covers the hole at the top of this cinch-style bag. This flap helps deter water and debris from entering your bag, and is something the other cinch-top bag, the Cotopaxi Luzon lacks.
A single daisy chain, ending in an ice axe loop don the back of the Flash.
Weight
Though it's not as impressive as the ultralight models, which each weigh less than 4 ounces, the Flash 18 isn't much more. This bag tips the scales at just 9 ounces, including all the removable straps and pads that you could leave behind to save weight. With no internal frame or extra padding to make it heavier, the Flash saves you some precious ounces. That being said, you're also sacrificing some comfort and durability compared to larger, beefier models. But we think these packs are best for different purposes anyway.
The Flash 18 is thin and light, but without cutting out every useful feature.
Ease of Use
As a top-loading pack, this bag can be tough to stay organized in or to dig out that last granola bar all the way at the bottom without completely upending the whole thing. And while we found the outer zippered pocket easy to get to while hiking, our main testers are also right-handed, and swing the pack around to the right side. Folks who tend in the opposite direction might not be so in love.
One feature we found incredibly easy to use is the cinch top itself. REI designed this with handy pull loops that mean you never have to pinch the plastic clip to open or close this bag. Much easier than the traditional cinch of the Cotopaxi Luzon. Though the Flash is sold as a "unisex" bag, we found it to be a fairly small fit, especially if you don't want to tighten it all the way up to the base of your neck. Taller or larger users may be happier with a larger option, like the Luzon.
We love the little flap that helps keep unwanted things out of the Flash.
Durability
REI doesn't disclose the thickness of the Flash 18's fabric, but to us, it feels somewhere around 70-100D of ripstop nylon. This seems incredible in comparison to the paper-thin feel of the 40D Stuff Pack and 30D Ultra-Sil. But next to the 210/420D of the Osprey Sirrus and Gregory packs we tested, it's less impressive. We also noticed that while the bottom panel is a bit thicker, it's also not ripstop. We didn't have any issues during our testing, but we wouldn't recommend dragging this pack across granite if you can help it.
The bottom of the Flash is thicker, but not ripstop.
Best Applications
We think the Flash 18 is a good quick-grab bag for short hikes, running errands, or to stuff into a backpack or suitcase for a small excursion later. If you're looking for a pack you can load down with supplies for you and the kids and the dog and head out for the day, we'd recommend something with more padding and structure (and capacity!), like the Gregory Jade 28.
Useful pockets, a key clip, and a place to stash a hydration reservoir make this a pretty versatile bag for a lot of different uses - how many can you dream up?
Value
For the low price of just $40, the Flash 18 is a pretty useful little bag. We think it brings pretty good value to the table for what it is. Though if you're on the hunt for a serious day hiking pack without a serious price tag, we'd recommend a pack with a hip belt but a similar low price, the Gonex 35L. If your errands around town involve heavy, bulky items, you might instead consider the Osprey Tempest 20, our Top Pick for Around Town. But if this simple bag is what you need in your life, we think it's $40 well-spent.
Conclusion
The REI Flash 18 threads the gap between big, feature-filled daypacks and tiny, packable ultralight packs. It cuts out framing and a lot of padding but keeps a host of useful features that come in handy for just about any adventure. If that in between stage sounds like what you want, then the Flash might be the perfect fit for you. Though if you're a taller or larger pack-lover, you might consider a larger, but similar bag, the Cotopaxi Luzon 24L instead.
We enjoyed our short, lightweight jaunts in the REI Flash.
— Maggie Brandenburg