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Gossamer Gear Mariposa 60 vs REI Co-op Flash 55

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

Gossamer Gear Mariposa 60 is the lighter option — 392 g lighter than the REI Co-op Flash 55 (29% less weight). If grams matter to you, that is the one to beat.
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Spec Gossamer Gear Mariposa 60 REI Co-op Flash 55
Weight 968 g · 0.968 kg · 2.13 lb
size Medium, average weight with stock M Straight belt
 1,360 g · 1.360 kg · 3.00 lb
Brand Gossamer Gear REI Co-op
Category Backpack Backpack
Gossamer Gear Mariposa 60
968 g

Ultralight 60L frameless pack with sit pad back panel.

See it in your base weight → Full details →
REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

See it in your base weight → Full details →

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Gossamer Gear Mariposa 60 vs REI Co-op Flash 55: which should you buy?

If saving weight is your priority, the Gossamer Gear Mariposa 60 wins — at 968 g it is 392 g (29%) 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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