REI Co-op Flash Pack Review

Overview

REI’s Flash is the pack that lets a hiker drop below three pounds without paying cottage-industry prices. The second-generation design, released in 2023, added an adjustable torso length and a roll-top closure to a modular Packmod accessory system, and it is built for three-season trips with sensible loads. The trade-off is a suspension rated for about 30 pounds and a single top opening that makes digging for a puffy at the bottom of the pack a chore.

Key Specs

Spec	Value
Price	$229
Weight	1,276–1,588 g depending on size (55 and 65)
Stripped weight (55, lid and extras removed)	About 1,077 g (2 lb 6 oz)
Capacity	53–57 L in the 55; the 65 adds roughly 10 L (varies by torso size)
Max recommended load	30 lb
Frame	Internal spring steel perimeter frame
Fabric	Recycled Robic ripstop nylon, 100D body and 210D base
Closure	Roll-top with optional removable lid
Torso length	Adjustable (S/M/L)
Hydration	3 L reservoir sleeve with dual tube ports
Packmod system	Yes: removable pockets, compression straps, lid
DWR	PFC-free

Performance

Carry comfort

For a pack this light, the carry is the Flash’s best surprise. Instead of a hard frame sheet and aluminum stays, it uses a spring steel perimeter frame that flexes with the hiker’s stride while still moving load from shoulders to hips. The shoulder straps, back panel and hip belt carry moderately thick foam that owners say keeps pressure points away, and the foam is perforated so air can move through what is otherwise a contact-style back panel. The quick torso adjustment makes dialing in the fit straightforward.

The ceiling is the 30-pound recommendation. Below it, the pack stays comfortable all day. Above it, the lighter-duty suspension runs out of answers. One long-term user took a Flash past 2,500 miles, including an Appalachian Trail thru-hike, which suggests the design can go the distance for hikers who keep base weight in check.

Packmod system

Packmod is the Flash’s signature feature. The accessories include two hip belt pockets (one mesh, one ripstop), a mesh shoulder strap pocket, two side compression straps per side, a top lid and a tool loop. Every strap and attachment point is girth-hitched to a daisy chain instead of being sewn into the seams, so each piece can be removed, moved or re-angled without tools. Removing the shoulder strap pocket, extra compression straps and lid trims about 4 oz. Strip everything and the 55 drops to roughly 2 lb 6 oz.

The system has one irritation: the hip belt pockets feel clunky when installed, since the multiple attachment points add extra straps around the belt.

Organization and access

The roll-top collar extends far enough to swallow bulky gear and cinches down when the load shrinks. The side pockets are better than most in this class: the one nearest the hip belt is mesh and sized for a water bottle, angled forward so it can be reached without contortions. The other has a solid face fabric and fits tent poles or a compact shelter.

Access is the real complaint. With no front zipper, anything at the bottom of the main compartment means unloading the pack above it. On a cold afternoon, that gets old quickly.

Durability

The 100D Robic body is thin by backpacking standards, and the 210D base is there to handle rocks and rough ground when the pack is set down. For the 2023 update, REI strengthened the mesh and added ripstop fabric along the middle of the big front pocket, which helps in brushy terrain.

High-mileage reports are mixed. At least one PCT thru-hiker saw the stitching that joins the load lifters to the shoulder straps come undone mid-hike, and a replacement pack developed the same problem within three months. Those reports are not universal, but they matter to anyone planning a long section. The sternum strap also pops off its slider track with little provocation, a persistent nuisance more than a failure.

Noise

The mesh-on-mesh contact in the shoulder straps makes an audible swish on the move. Some hikers stop noticing after a day. Others never do.

Choosing a Version

The two sizes share the same frame, fabrics, roll-top and Packmod system. The difference is volume and mass.

Flash 55 (1,276 g). The 53–57 L pack suits weekend trips through roughly five-day carries, where food, a quilt and a shelter fit without strain. It also fits a BV500 or Garcia bear canister. It is the better match for the 30-pound limit, since the pack’s volume and its load rating line up.

Flash 65 (1,588 g). The 65 weighs 312 g (about 11 oz, or roughly 24 percent) more and adds around 10 L of nominal space. That helps with bulky winter insulation, long resupply-free stretches or a canister plus a full food haul. The load rating stays at 30 pounds, so the extra room does not buy extra carrying capacity. Hikers who tend to pack light but bulky get the most from it. Anyone who fills the volume with dense weight will outrun the suspension.

For most hikers, the 55 is the more sensible pick, and the roll-top lets it expand a little for longer stretches.

Pros & Cons

Pros

• $229 buys a framed, adjustable pack that undercuts most ultralight rivals by a wide margin
• The 55 comes in under three pounds, and Packmod removal trims it further
• Torso adjustment makes a good fit achievable for most builds
• Packmod pieces can be added, moved or removed without tools
• Fits a BV500 or Garcia Backpacker’s Cache canister
• Recycled fabrics and PFC-free DWR

Cons

• Suspension is rated for about 30 lb, in both sizes
• Roll-top only, with no front or side access to the main compartment
• Load lifter stitching has failed on some high-mileage thru-hikes
• Shoulder straps swish audibly
• Hip belt pockets feel clunky when mounted
• No rain cover included; REI suggests a Duck’s Back cover at about $30 extra

Who Should Buy This

The Flash fits hikers who want a conventional-feeling pack with a light weight, whether they are finishing a long trail or just starting out. Beginners moving off a heavier pack get room to experiment, since Packmod lets them sort out their pocket preferences without buying a second pack. A hiker carrying 20 to 30 lb will find a lot to like.

Hikers with sub-20 lb base weights who count every gram will eventually outgrow it and look at Hyperlite or Zpacks. So will anyone whose loads regularly exceed 30 lb, or who wants quick side or front access to the main compartment.

Verdict

The Flash hits a rare balance of weight, comfort and price, and Packmod is more than a marketing gimmick. The 55 is the version to buy for most trips, while the 65 makes sense for bulky, long-haul loads that stay under the 30-lb limit. Thru-hikers should watch the load lifter stitching, but for three-season backpackers carrying sensible loads, it remains one of the best values on the trail.