← Gear database

Rab Mythic Ultra 360 (22°F) vs Western Mountaineering AlpinLite 20

Weight and specs compared for 2026 — and which one to choose.

Rab Mythic Ultra 360 (22°F) is the lighter option — 273 g lighter than the Western Mountaineering AlpinLite 20 (31% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Rab Mythic Ultra 360 (22°F) Western Mountaineering AlpinLite 20
Weight 606 g · 0.606 kg · 1.34 lb 879 g · 0.879 kg · 1.94 lb
Brand Rab Western Mountaineering
Category Sleep System Sleep System
Rab Mythic Ultra 360 (22°F)
606 g

Spring/fall sleeping bag at 21.4 oz (606g) with 900-fill hydrophobic European goose down and integrated thermal liner technology.

Full details →
Western Mountaineering AlpinLite 20
879 g

Roomy 20F mummy bag with 850+ goose down and continuous baffles, balancing warmth, comfort and low weight.

Full details →

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

Rab Mythic Ultra 360 (22°F) vs Western Mountaineering AlpinLite 20: which should you buy?

If saving weight is your priority, the Rab Mythic Ultra 360 (22°F) wins — at 606 g it is 273 g (31%) lighter than the Western Mountaineering AlpinLite 20 (879 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.

More sleep system comparisons

Rab Mythic Ultra 360 (22°F) vs Sea to Summit Aeros Ultralight Pillow Rab Mythic Ultra 360 (22°F) vs Sea to Summit Aeros Ultralight Pillow (Regular) Rab Mythic Ultra 360 (22°F) vs NEMO Fillo Elite Rab Mythic Ultra 360 (22°F) vs Nemo Fillo Elite Wide UL Rab Mythic Ultra 360 (22°F) vs Nemo Equipment Tensor Elite Ultralight Rab Mythic Ultra 360 (22°F) vs NEMO Equipment Tensor Elite Sleeping Pad