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Bear Grylls Emergency Bivy vs SPOT Gen4

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

Bear Grylls Emergency Bivy is the lighter option — 36 g lighter than the SPOT Gen4 (24% less weight). If grams matter to you, that is the one to beat.
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Spec Bear Grylls Emergency Bivy SPOT Gen4
Weight 113 g · 0.113 kg · 0.25 lb 149 g · 0.149 kg · 0.33 lb
Brand Bear Grylls SPOT
Category Safety Safety
Bear Grylls Emergency Bivy
113 g

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

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SPOT Gen4
149 g

One-way satellite tracker with SOS capability.

Full details →

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Bear Grylls Emergency Bivy vs SPOT Gen4: which should you buy?

If saving weight is your priority, the Bear Grylls Emergency Bivy wins — at 113 g it is 36 g (24%) lighter than the SPOT Gen4 (149 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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