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Montbell Plasma 1000 vs REI Co-op Magma 850 Down Jacket

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

Montbell Plasma 1000 is the lighter option — 231 g lighter than the REI Co-op Magma 850 Down Jacket (62% less weight). If grams matter to you, that is the one to beat.
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Spec Montbell Plasma 1000 REI Co-op Magma 850 Down Jacket
Weight 139 g · 0.139 kg · 0.31 lb 370 g · 0.370 kg · 0.82 lb
Brand Montbell REI Co-op
Category Clothing - Mid Layer Clothing - Mid Layer
Montbell Plasma 1000
139 g

Ultralight down jacket with 1000-fill goose down. Men's weighs just 139g with exceptional warmth-to-weight.

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REI Co-op Magma 850 Down Jacket
370 g

Responsible down 850-fill jacket at excellent value.

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Montbell Plasma 1000 vs REI Co-op Magma 850 Down Jacket: which should you buy?

If saving weight is your priority, the Montbell Plasma 1000 wins — at 139 g it is 231 g (62%) lighter than the REI Co-op Magma 850 Down Jacket (370 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 clothing - mid layer page, or browse the full gear weight database.

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