← Gear database

Acme Tornado 636 vs Bear Grylls Emergency Bivy

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

Acme Tornado 636 is the lighter option — 101 g lighter than the Bear Grylls Emergency Bivy (89% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Acme Tornado 636 Bear Grylls Emergency Bivy
Weight 12 g · 0.012 kg · 0.03 lb 113 g · 0.113 kg · 0.25 lb
Brand Acme Bear Grylls
Category Safety Safety
Acme Tornado 636
12 g

Loud pealess emergency whistle. Standard SAR equipment.

Full details →
Bear Grylls Emergency Bivy
113 g

Tear and puncture-resistant mylar bivy. Only 4 oz for emergency backup shelter.

Full details →

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

Acme Tornado 636 vs Bear Grylls Emergency Bivy: which should you buy?

If saving weight is your priority, the Acme Tornado 636 wins — at 12 g it is 101 g (89%) lighter than the Bear Grylls Emergency Bivy (113 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.

More safety comparisons

Acme Tornado 636 vs Fox 40 Micro Whistle Acme Tornado 636 vs Edelrid NINETEEN G Acme Tornado 636 vs Cypher Climbing Mydas Ultra II Acme Tornado 636 vs Unknown Phantom Carabiner Acme Tornado 636 vs Camp Photon Acme Tornado 636 vs Black Diamond Oz Screwgate Carabiner