Sea to Summit Ember Down Sleeping Bag vs Therm-a-Rest NeoAir XLite NXT

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

Therm-a-Rest NeoAir XLite NXT is the lighter option — 255 g lighter than the Sea to Summit Ember Down Sleeping Bag (42% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit Ember Down Sleeping Bag	Therm-a-Rest NeoAir XLite NXT
Weight	609 g · 0.609 kg · 1.34 lb	354 g · 0.354 kg · 0.78 lb
Brand	Sea to Summit	Therm-a-Rest
Category	Sleep System	Sleep System

Sea to Summit Ember Down Sleeping Bag

609 g

850+ Ultradry down sleeping bag rated to 9°C; packs to 5.1L with soft Thermolite liner and recycled shell fabric.

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Therm-a-Rest NeoAir XLite NXT

354 g

Ultralight inflatable sleeping pad with R-value 4.5.

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Sea to Summit Ember Down Sleeping Bag vs Therm-a-Rest NeoAir XLite NXT: which should you buy?

If saving weight is your priority, the Therm-a-Rest NeoAir XLite NXT wins — at 354 g it is 255 g (42%) lighter than the Sea to Summit Ember Down Sleeping Bag (609 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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