Nunatak Sastrugi Sleeping Bag (22°F) vs Rab Mythic Ultra 360 (22°F)
Weight and specs compared for 2026 — and which one to choose.
Custom ultralight sleeping bag with 900-fill goose down. 614g for 22-degree regular-width medium-length configuration. Made to order with customization options
Full details →Spring/fall sleeping bag at 21.4 oz (606g) with 900-fill hydrophobic European goose down and integrated thermal liner technology.
Full details →HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Nunatak Sastrugi Sleeping Bag (22°F) vs Rab Mythic Ultra 360 (22°F): which should you buy?
If saving weight is your priority, the Rab Mythic Ultra 360 (22°F) wins — at 606 g it is 8 g (1%) lighter than the Nunatak Sastrugi Sleeping Bag (22°F) (614 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.