← Gear database

Fox 40 Micro Whistle vs Ortovox Bivy Ultralight

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

Fox 40 Micro Whistle is the lighter option — 188 g lighter than the Ortovox Bivy Ultralight (95% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Fox 40 Micro Whistle Ortovox Bivy Ultralight
Weight 10 g · 0.010 kg · 0.02 lb 198 g · 0.198 kg · 0.44 lb
Brand Fox 40 Ortovox
Category Safety Safety
Fox 40 Micro Whistle
10 g

Pealess safety whistle audible up to 1km.

Full details →
Ortovox Bivy Ultralight
198 g

Lightweight emergency shelter at only 7 oz. Insurance against unexpected weather conditions.

Full details →

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

Fox 40 Micro Whistle vs Ortovox Bivy Ultralight: which should you buy?

If saving weight is your priority, the Fox 40 Micro Whistle wins — at 10 g it is 188 g (95%) lighter than the Ortovox Bivy Ultralight (198 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

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