Acme Tornado 636 vs SOL Escape Bivvy

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

Acme Tornado 636 is the lighter option — 130 g lighter than the SOL Escape Bivvy (92% less weight). If grams matter to you, that is the one to beat.

Spec	Acme Tornado 636	SOL Escape Bivvy
Weight	12 g · 0.012 kg · 0.03 lb	142 g · 0.142 kg · 0.31 lb
Brand	Acme	SOL
Category	Safety	Safety

Acme Tornado 636

12 g

Loud pealess emergency whistle. Standard SAR equipment.

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SOL Escape Bivvy

142 g

Breathable emergency bivvy bag. Reflects 70% of body heat.

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Acme Tornado 636 vs SOL Escape Bivvy: which should you buy?

If saving weight is your priority, the Acme Tornado 636 wins — at 12 g it is 130 g (92%) lighter than the SOL Escape Bivvy (142 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.

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