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Therm-a-Rest Vesper 32°F Sleeping Bag vs Zpacks Classic Sleeping Bag 20F

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 Vesper 32°F Sleeping Bag Zpacks Classic Sleeping Bag 20F
Weight 550 g · 0.550 kg · 1.21 lb 533 g · 0.533 kg · 1.18 lb
size Standard-Medium (fits up to 6'0"), 20°F; no size called Regular exists
Brand Therm-a-Rest Zpacks
Category Sleep System Sleep System
Therm-a-Rest Vesper 32°F Sleeping Bag
550 g

Premium ultralight sleeping bag with 900-fill hydrophobic goose down. Rated to 32°F (0°C) with mummy fit and draft collar for warmth retention.

See it in your base weight → Full details →
Zpacks Classic Sleeping Bag 20F
533 g

Mummy-style sleeping bag rated to 20F (-7C) with 900-fill goose down. DCF outer shell for low weight and packability. Water-resistant treatment included.

See it in your base weight → Full details →

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Therm-a-Rest Vesper 32°F Sleeping Bag vs Zpacks Classic Sleeping Bag 20F: 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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