Therm-a-Rest Hyperion 20F/-6C (Regular) vs Therm-a-Rest Vesper 32

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

Therm-a-Rest Vesper 32 is the lighter option — 17 g lighter than the Therm-a-Rest Hyperion 20F/-6C (Regular) (3% less weight). If grams matter to you, that is the one to beat.

Spec	Therm-a-Rest Hyperion 20F/-6C (Regular)	Therm-a-Rest Vesper 32
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.

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Therm-a-Rest Vesper 32

550 g

Ultralight 32°F sleeping bag with 900-fill-power hydrophobic goose down. Excellent warmth-to-weight ratio for 3-season backpacking.

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Therm-a-Rest Hyperion 20F/-6C (Regular) vs Therm-a-Rest Vesper 32: which should you buy?

If saving weight is your priority, the Therm-a-Rest Vesper 32 wins — at 550 g it is 17 g (3%) lighter than the Therm-a-Rest Hyperion 20F/-6C (Regular) (567 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 sleep system page, or browse the full gear weight database.

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