Sea to Summit Spark Pro Down Sleeping Bag vs Western Mountaineering Versalite 10°F
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.
Check price Full details →850-fill down sleeping bag rated to 10°F (-12°C).
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Sea to Summit Spark Pro Down Sleeping Bag vs Western Mountaineering Versalite 10°F: which should you buy?
If saving weight is your priority, the Sea to Summit Spark Pro Down Sleeping Bag wins — at 765 g it is 85 g (10%) lighter than the Western Mountaineering Versalite 10°F (850 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.