← All gear comparisons

REI Co-op Flash 55 vs REI Co-op Flash Air 50

Weight and specs compared for 2026 — and which one to choose.

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

Swipe to see all details.

Spec REI Co-op Flash 55 REI Co-op Flash Air 50
Weight 1,360 g · 1.360 kg · 3.00 lb 868 g · 0.868 kg · 1.91 lb
Brand REI Co-op REI Co-op
Category Backpack Backpack
REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

See it in your base weight → Full details →
REI Co-op Flash Air 50
868 g

Ultralight 50L pack with 3D contoured hip belt and ventilated back panel. Made from PFAS-free UHMWPE fabric with DWR coating.

See it in your base weight → Full details →

Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

REI Co-op Flash 55 vs REI Co-op Flash Air 50: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

See where both rank against everything else in this category on the lightest backpack page, or browse the full gear weight database.

More backpack comparisons

REI Co-op Flash 55 vs Six Moon Designs Swift X REI Co-op Flash 55 vs Gossamer Gear Mariposa 60 REI Co-op Flash 55 vs Decathlon Forclaz MT900 UL 50+10L REI Co-op Flash 55 vs Granite Gear Blaze 60 REI Co-op Flash 55 vs REI Co-op Trailmade 60 REI Co-op Flash 55 vs Gregory Stout 60