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NEMO Tensor Extreme Conditions vs Sea to Summit Ember Down Sleeping Bag

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

NEMO Tensor Extreme Conditions is the lighter option — 127 g lighter than the Sea to Summit Ember Down Sleeping Bag (21% less weight). If grams matter to you, that is the one to beat.
Spec NEMO Tensor Extreme Conditions Sea to Summit Ember Down Sleeping Bag
Weight 482 g · 0.482 kg · 1.06 lb 609 g · 0.609 kg · 1.34 lb
Brand NEMO Sea to Summit
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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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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NEMO Tensor Extreme Conditions vs Sea to Summit Ember Down Sleeping Bag: which should you buy?

If saving weight is your priority, the NEMO Tensor Extreme Conditions wins — at 482 g it is 127 g (21%) 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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