Rab Mythic Ultra (20°F) vs Sea to Summit Ether Light XT
Weight and specs compared for 2026 — and which one to choose.
Winter-capable sleeping bag at 24.7 oz (700g) with 900-fill hydrophobic down, ideal for 3-season to winter transition camping.
Full details →Ultralight air sleeping pad with 3D construction for comfort.
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Rab Mythic Ultra (20°F) vs Sea to Summit Ether Light XT: which should you buy?
If saving weight is your priority, the Sea to Summit Ether Light XT wins — at 435 g it is 265 g (38%) lighter than the Rab Mythic Ultra (20°F) (700 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.