Rab Mythic Ultra vs Rab Mythic Ultra 20
Weight and specs compared for 2026 — and which one to choose.
20-degree sleeping bag weighing 440g. Features TILT lining technology that reflects heat back to achieve superior warmth-to-weight ratio.
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.
HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Rab Mythic Ultra vs Rab Mythic Ultra 20: which should you buy?
If saving weight is your priority, the Rab Mythic Ultra wins — at 300 g it is 140 g (32%) lighter than the Rab Mythic Ultra 20 (440 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.