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ACR Electronics Bivy Stick vs Cypher Climbing Mydas Ultra II

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

Cypher Climbing Mydas Ultra II is the lighter option — 76 g lighter than the ACR Electronics Bivy Stick (76% less weight). If grams matter to you, that is the one to beat.
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Spec ACR Electronics Bivy Stick Cypher Climbing Mydas Ultra II
Weight 100 g · 0.100 kg · 0.22 lb 24 g · 0.024 kg · 0.05 lb
Brand ACR Electronics Cypher Climbing
Category Safety Safety
ACR Electronics Bivy Stick
100 g

Compact two-way satellite communicator with SOS, GPS tracking and app-based messaging over the global Iridium network.

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Cypher Climbing Mydas Ultra II
24 g

Ultralight carabiner at 0.85oz with 22kN rating. Wire gate design.

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ACR Electronics Bivy Stick vs Cypher Climbing Mydas Ultra II: which should you buy?

If saving weight is your priority, the Cypher Climbing Mydas Ultra II wins — at 24 g it is 76 g (76%) lighter than the ACR Electronics Bivy Stick (100 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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