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Rab Mythic Ultra 20 vs Therm-a-Rest NeoAir XTherm NXT

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

Therm-a-Rest NeoAir XTherm NXT is the lighter option — 10 g lighter than the Rab Mythic Ultra 20 (2% less weight). If grams matter to you, that is the one to beat.
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Spec Rab Mythic Ultra 20 Therm-a-Rest NeoAir XTherm NXT
Weight 440 g · 0.440 kg · 0.97 lb 430 g · 0.430 kg · 0.95 lb
Brand Rab Therm-a-Rest
Category Sleep System Sleep System
Rab Mythic Ultra 20
440 g

20-degree sleeping bag weighing 440g. Features TILT lining technology that reflects heat back to achieve superior warmth-to-weight ratio.

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Therm-a-Rest NeoAir XTherm NXT
430 g

4-season inflatable sleeping pad with R-value 7.3.

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Rab Mythic Ultra 20 vs Therm-a-Rest NeoAir XTherm NXT: which should you buy?

If saving weight is your priority, the Therm-a-Rest NeoAir XTherm NXT wins — at 430 g it is 10 g (2%) lighter than the Rab Mythic Ultra 20 (440 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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