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Acme Tornado 636 vs Ortovox Bivy Ultralight
Weight and specs compared for 2026 — and which one to choose.
Acme Tornado 636 is the lighter option — 186 g lighter than the Ortovox Bivy Ultralight (94% less weight). If grams matter to you, that is the one to beat.
Ortovox Bivy Ultralight
198 g
Lightweight emergency shelter at only 7 oz. Insurance against unexpected weather conditions.
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Acme Tornado 636 vs Ortovox Bivy Ultralight: which should you buy?
If saving weight is your priority, the Acme Tornado 636 wins — at 12 g it is 186 g (94%) lighter than the Ortovox Bivy Ultralight (198 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 safety page, or browse the full gear weight database.