Arc'teryx Alpha SL Jacket vs Rab Downpour Light Jacket
Weight and specs compared for 2026 — and which one to choose.
Packable 2.5L waterproof jacket with fully taped seams and helmet-compatible hood; packs to softball size, 7.7 oz for all-day rain protection.
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Arc'teryx Alpha SL Jacket vs Rab Downpour Light Jacket: which should you buy?
If saving weight is your priority, the Rab Downpour Light Jacket wins — at 219 g it is 61 g (22%) lighter than the Arc'teryx Alpha SL Jacket (280 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 - outer layer page, or browse the full gear weight database.