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Nunatak Sastrugi Sleeping Bag (22°F) vs Sea to Summit Spark Pro Down 30

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

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

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Spec Nunatak Sastrugi Sleeping Bag (22°F) Sea to Summit Spark Pro Down 30
Weight 614 g · 0.614 kg · 1.35 lb 619 g · 0.619 kg · 1.36 lb
size Regular
Brand Nunatak Sea to Summit
Category Sleep System Sleep System
Nunatak Sastrugi Sleeping Bag (22°F)
614 g

Custom ultralight sleeping bag with 900-fill goose down. 614g for 22-degree regular-width medium-length configuration. Made to order with customization options

See it in your base weight → Full details →
Sea to Summit Spark Pro Down 30
619 g

Ultralight mummy bag rated to 30F (-1C) with 950+ fill-power Ultra-Dry Down. 10-denier shell, shoulder and footbox zippers for temperature control.

See it in your base weight → Full details →

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Nunatak Sastrugi Sleeping Bag (22°F) vs Sea to Summit Spark Pro Down 30: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.

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