Big Agnes Fly Creek UL Quilt vs Sea to Summit Spark 30 Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight backpacking quilt with 850-fill DownTek water-repellent down and 227g fill weight. Packable and versatile for three-season use.
Full details →Ultralight 30°F mummy bag filled with 850+ loft down. Differential cut and ripstop shell deliver excellent warmth-to-weight ratio.
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Big Agnes Fly Creek UL Quilt vs Sea to Summit Spark 30 Sleeping Bag: which should you buy?
If saving weight is your priority, the Big Agnes Fly Creek UL Quilt wins — at 434 g it is 48 g (10%) lighter than the Sea to Summit Spark 30 Sleeping Bag (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.