Western Mountaineering MegaLite 35°F vs Western Mountaineering Ultralite 20F Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight 850-fill down bag for warm summer conditions.
Full details →Hand-sewn sleeping bag, 29oz, 850+ fill power goose down, three-season
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Western Mountaineering MegaLite 35°F vs Western Mountaineering Ultralite 20F Sleeping Bag: which should you buy?
If saving weight is your priority, the Western Mountaineering MegaLite 35°F wins — at 510 g it is 312 g (38%) lighter than the Western Mountaineering Ultralite 20F Sleeping Bag (822 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.