Sea to Summit Spark Pro Down Sleeping Bag vs Therm-a-Rest NeoAir XLite NXT Regular
Weight and specs compared for 2026 — and which one to choose.
Ultralight down sleeping bag at 765g with 900+ fillpower RDS-certified down, 15°F rating and Free-Flow Zip system for versatility.
Full details →Inflatable sleeping pad with R-value 4.5, 7.6cm thickness, Triangular Core Matrix baffles for warmth, and WingLock valve for fast inflation.
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Sea to Summit Spark Pro Down Sleeping Bag vs Therm-a-Rest NeoAir XLite NXT Regular: which should you buy?
If saving weight is your priority, the Therm-a-Rest NeoAir XLite NXT Regular wins — at 369 g it is 396 g (52%) lighter than the Sea to Summit Spark Pro Down Sleeping Bag (765 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.