Why buy REI's ultralight pack over a cottage brand?

The return policy — you can try it on in a store, take it out, and bring it back if the fit is wrong, which no made-to-order cottage pack allows. In a category where fit mistakes are expensive, that's a bigger feature than any fabric spec.

What kind of loads suit it?

It's built around genuine ultralight base weights: the shaped spring-steel frame transfers weight far better than a frameless pack, but REI publishes no official maximum and this is not a 40 lb hauler. Loads in the 20s are its comfort zone, which is typical for a 32 oz framed pack.

Is it waterproof like the Ultra-fabric packs?

No — the UHMWPE ripstop resists tears like the gridstop fabrics, but it's a woven nylon that will wet through, so run a pack liner. At $299 that's the main spec you give up against the laminate packs at $330-450.

Will a bear canister fit?

It's workable but tight — 50 L takes a canister, and a canister plus a long food carry fills the pack fast. For occasional canister weekends it's fine; canister-heavy itineraries carry better in the 58-68 L options.

Anything unusual about the frame?

The shaped spring steel flexes and returns rather than taking a permanent set the way aluminum stays can — though truly severe overloading can still deform it. It's a big part of why the pack carries above what its weight suggests.

🎒

Ultralight Pack

~$299

REI Co-op

REI Co-op Flash Air 50

Name: REI Co-op Flash Air 50
Brand: REI Co-op
Price: 299 USD
Availability: InStock
Rating: 4.1 (49 reviews)

★4.1(49 reviews)

The Flash Air is REI's ultralight pack, using a shaped spring steel frame rather than stays or a hoop. It is the only pack in this group backed by a mainstream retailer's return policy, which matters more than usual in a segment dominated by made-to-order cottage brands.

Approx. price

~$299

Capacity

50 L

Weight

2.0 lbs

Best For

Hikers wanting an ultralight pack they can return easily if the fit is wrong

Buy from REI Co-op →

Price and availability on REI Co-op’s site may differ.

Specifications

What do these specs mean? →

Type

Ultralight Pack

Frame Type

Internal Frame

Capacity

50 L

Weight

2.0 lbs

Max Recommended Load

Not specified by the manufacturer

Torso Fit

See manufacturer sizing

Material

UHMWPE ripstop nylon

Back Panel

Spring steel stays with foam padded back

Warranty

Manufacturer warranty; terms not published

Raincover Included

Fits BV500 Bear Canister

Features

Hipbelt Pockets

Pros

✓Backed by REI's return policy, which is uniquely valuable in a segment where most packs are made to order.
✓A shaped spring steel frame flexes and returns rather than taking a set like aluminium stays.
✓UHMWPE ripstop gives gridstop-style tear resistance.
✓32 oz for 50 L is competitive with cottage packs at similar prices.
✓Available to try on in person at REI stores, which no cottage pack is.
✓$299 sits mid-range for the segment.
✓Foam padded back adds comfort the minimalist packs omit.
✓Hipbelt pockets included.

Cons

✗No published maximum load figure.
✗Heavier than the Bonfus Framus while carrying 8 L less.
✗Spring steel frames can deform permanently if badly overloaded.
✗No adjustable torso.
✗Not waterproof, unlike the Ultra-fabric packs at this price.
✗REI's ultralight design heritage is shorter than the cottage brands'.
✗Fewer configuration options than a made-to-order pack.
✗50 L is tight for a bear canister plus a long food carry.

Common Questions

Compare the REI Co-op Flash Air 50

vs REI Co-op Traverse 60 vs ULA Circuit

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