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Fox 40 Micro Whistle vs Unknown Phantom Carabiner

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

Fox 40 Micro Whistle is the lighter option — 18 g lighter than the Unknown Phantom Carabiner (64% less weight). If grams matter to you, that is the one to beat.
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Spec Fox 40 Micro Whistle Unknown Phantom Carabiner
Weight 10 g · 0.010 kg · 0.02 lb 28 g · 0.028 kg · 0.06 lb
Brand Fox 40 Unknown
Category Safety Safety
Fox 40 Micro Whistle
10 g

Pealess safety whistle audible up to 1km.

Full details →
Unknown Phantom Carabiner
28 g

Lightweight climbing carabiner at 1oz. Full UIAA certified.

Full details →

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Fox 40 Micro Whistle vs Unknown Phantom Carabiner: which should you buy?

If saving weight is your priority, the Fox 40 Micro Whistle wins — at 10 g it is 18 g (64%) lighter than the Unknown Phantom Carabiner (28 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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