Therm-a-Rest NeoAir XLite NXT vs Therm-a-Rest Vesper 20 Sleeping Bag

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

Therm-a-Rest NeoAir XLite NXT is the lighter option — 196 g lighter than the Therm-a-Rest Vesper 20 Sleeping Bag (36% less weight). If grams matter to you, that is the one to beat.

Spec	Therm-a-Rest NeoAir XLite NXT	Therm-a-Rest Vesper 20 Sleeping Bag
Weight	354 g · 0.354 kg · 0.78 lb	550 g · 0.550 kg · 1.21 lb
Brand	Therm-a-Rest	Therm-a-Rest
Category	Sleep System	Sleep System

Therm-a-Rest NeoAir XLite NXT

354 g

Ultralight inflatable sleeping pad with R-value 4.5.

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Therm-a-Rest Vesper 20 Sleeping Bag

550 g

900-fill hydrophobic goose down sleeping bag rated to 20°F/-6°C. Ultralight and highly compressible for three-season backpacking.

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Therm-a-Rest NeoAir XLite NXT vs Therm-a-Rest Vesper 20 Sleeping Bag: which should you buy?

If saving weight is your priority, the Therm-a-Rest NeoAir XLite NXT wins — at 354 g it is 196 g (36%) lighter than the Therm-a-Rest Vesper 20 Sleeping Bag (550 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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