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Lowe Alpine AirZone Active 18 vs REI Co-op Flash Air 50

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

Lowe Alpine AirZone Active 18 is the lighter option — 98 g lighter than the REI Co-op Flash Air 50 (11% less weight). If grams matter to you, that is the one to beat.
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Spec Lowe Alpine AirZone Active 18 REI Co-op Flash Air 50
Weight 770 g · 0.770 kg · 1.70 lb 868 g · 0.868 kg · 1.91 lb
Brand Lowe Alpine REI Co-op
Category Backpack Backpack
Lowe Alpine AirZone Active 18
770 g

Lightweight 18-liter daypack for hiking and outdoor activities. Features ergonomic back panel, padded straps and adjustable capacity from 18-20 liters.

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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.

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Lowe Alpine AirZone Active 18 vs REI Co-op Flash Air 50: which should you buy?

If saving weight is your priority, the Lowe Alpine AirZone Active 18 wins — at 770 g it is 98 g (11%) lighter than the REI Co-op Flash Air 50 (868 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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