Cumulus Aerial 250 vs Zpacks Sleeping Bag 20°F
Weight and specs compared for 2026 — and which one to choose.
Ultralight down sleeping bag with 900 FP goose down, single-layer design with no zipper, perfect for thru-hiking and backpacking.
Ultralight 900-fill down sleeping bag rated to 20°F.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Cumulus Aerial 250 vs Zpacks Sleeping Bag 20°F: which should you buy?
If saving weight is your priority, the Cumulus Aerial 250 wins — at 385 g it is 12 g (3%) lighter than the Zpacks Sleeping Bag 20°F (397 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.