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Therm-a-Rest Hyperion 20F/-6C (Regular) vs Therm-a-Rest Vesper 900

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 Therm-a-Rest Hyperion 20F/-6C (Regular) Therm-a-Rest Vesper 900
Weight 567 g · 0.567 kg · 1.25 lb 550 g · 0.550 kg · 1.21 lb
Brand Therm-a-Rest Therm-a-Rest
Category Sleep System Sleep System
Therm-a-Rest Hyperion 20F/-6C (Regular)
567 g

Ultralight 20F down mummy bag with 900-fill Nikwax Hydrophobic Down for fast-and-light backpacking.

See it in your base weight → Full details →
Therm-a-Rest Vesper 900
550 g

Ultralight sleeping bag with 900 fill-power hydrophobic goose down. 360g of down fill. Excellent warmth-to-weight ratio for three-season backpacking trips.

See it in your base weight → Full details →

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Therm-a-Rest Hyperion 20F/-6C (Regular) vs Therm-a-Rest Vesper 900: 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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