Rab · Sleeping Gear

Mythic 400 Sleeping Bag: 20F Down

40% OFF

$526.50

$877.50Save $351.00 (40%)

at Steep & Cheap

Also check

Check price

Links may earn us a commission. Prices are never affected.Details

Price Historylast 38 days

Lowest price in 1 months

Low $526.50 · High $526.50. Hover the line to see each change.

About this product

The Rab Mythic 400 is a mummy-style sleeping bag rated to 20F (-6.67C), designed for alpine and fast-and-light pursuits where weight savings are critical. Its 900-fill-power goose down carries RDS certification and is treated with a Nikwax hydrophobic coating to maintain loft in damp conditions. The shell uses a 7D Atmos ripstop fabric, which balances durability with an exceptionally low weight footprint. Chevron baffles distribute the down evenly throughout the bag, preventing cold spots caused by fill migration. An adjustable draft tube along the zipper seals out cold air drafts at the closure. The package includes a waterproof roll-top stuff sack for wet-weather protection during transport, as well as a cotton storage sack that allows the down to breathe and recover its loft during long-term storage. This combination of high-fill-power insulation, moisture-resistant treatment, and refined construction makes the Mythic 400 a capable choice for three-season and shoulder-season alpine use.

Category: Sleeping Gear
Brand: Rab

What people are saying

Reviewers consistently praise the Rab Mythic 400 for its exceptional warmth-to-weight ratio, crediting the 900-fill-power goose down and chevron baffle construction for impressive loft and insulation. Its ultralight build, weighing just over a pound, and highly packable form make it a favorite among fastpackers, alpinists, and ultralight backpackers. The Pertex Quantum shell fabric is noted for its silky feel and durability even after heavy use. The most common criticisms center on the half-length zipper, which limits ventilation on warmer nights and can snag, and the narrow, tapered cut, which feels restrictive for larger users or side sleepers. Some users also question whether the stated 20F temperature rating holds up in real-world conditions, particularly for cold sleepers. It is available in only one size and one color, which limits versatility. Overall, reviewers view it as a specialist tool that excels in its niche but comes at a premium price.