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REI Co-op Flash 55 vs Zpacks Nero Classic Backpack

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

Zpacks Nero Classic Backpack is the lighter option — 1,071 g lighter than the REI Co-op Flash 55 (79% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Flash 55 Zpacks Nero Classic Backpack
Weight 1,360 g · 1.360 kg · 3.00 lb 289 g · 0.289 kg · 0.64 lb
Brand REI Co-op Zpacks
Category Backpack Backpack
REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

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Zpacks Nero Classic Backpack
289 g

Ultralight frameless Dyneema Composite backpack, just 289g. Roll-top closure with mesh side pockets. Ideal for SUL hikers carrying under 10 lbs base weight.

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REI Co-op Flash 55 vs Zpacks Nero Classic Backpack: which should you buy?

If saving weight is your priority, the Zpacks Nero Classic Backpack wins — at 289 g it is 1,071 g (79%) lighter than the REI Co-op Flash 55 (1,360 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

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

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