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NEMO Tensor Extreme Conditions vs Rab Mythic Ultra 20

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

Rab Mythic Ultra 20 is the lighter option — 42 g lighter than the NEMO Tensor Extreme Conditions (9% less weight). If grams matter to you, that is the one to beat.
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Spec NEMO Tensor Extreme Conditions Rab Mythic Ultra 20
Weight 482 g · 0.482 kg · 1.06 lb 440 g · 0.440 kg · 0.97 lb
Brand NEMO Rab
Category Sleep System Sleep System
NEMO Tensor Extreme Conditions
482 g

Four-season insulated air pad delivering an 8.5 R-value at just 17oz. Among the lightest extremely well-insulated backpacking pads. Regular mummy.

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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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NEMO Tensor Extreme Conditions vs Rab Mythic Ultra 20: which should you buy?

If saving weight is your priority, the Rab Mythic Ultra 20 wins — at 440 g it is 42 g (9%) lighter than the NEMO Tensor Extreme Conditions (482 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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