Sea to Summit Ether Light XT vs Zpacks Classic Sleeping Bag 20F

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

Zpacks Classic Sleeping Bag 20F is the lighter option — 88 g lighter than the Sea to Summit Ether Light XT (20% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit Ether Light XT	Zpacks Classic Sleeping Bag 20F
Weight	435 g · 0.435 kg · 0.96 lb	347 g · 0.347 kg · 0.77 lb
Brand	Sea to Summit	Zpacks
Category	Sleep System	Sleep System

Sea to Summit Ether Light XT

435 g

Ultralight air sleeping pad with 3D construction for comfort.

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Zpacks Classic Sleeping Bag 20F

347 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.

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Sea to Summit Ether Light XT vs Zpacks Classic Sleeping Bag 20F: which should you buy?

If saving weight is your priority, the Zpacks Classic Sleeping Bag 20F wins — at 347 g it is 88 g (20%) lighter than the Sea to Summit Ether Light XT (435 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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