Mythic Sleeping Bag: 20F Down

35% OFF

$548.44

$843.75Save $295.31 (35%)

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Low $548.44 · High $877.50. Hover the line to see each change.

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About this product

The Rab Mythic Sleeping Bag is a 20F down bag engineered for fast-and-light backpacking and alpine use, where minimizing weight and packed volume are priorities. It is filled with 900-fill-power goose down, one of the higher fill powers available in consumer sleeping bags, delivering strong warmth relative to its weight. The shell is constructed from an ultralight 10-denier Pertex Quantum fabric, which contributes to the bag's impressive packability. Inside, L.O.F.T 3D baffles are designed to eliminate cold spots while also reducing overall weight, and the TILT lining reflects body heat back to the sleeper to limit thermal loss. The tapered mummy cut further improves thermal efficiency by reducing dead air space. Together these features make the Mythic 20F a well-considered option for three-season and shoulder-season alpine conditions where carrying a capable, compressible sleep system matters.

Category: Sleeping Gear
Brand: Rab
Material: [face] 10D Pertex Quantum (100% nylon ripstop, PFC-free DWR finish), [lining] 10D Atmos (100% recycled nylon), Thermo Ionic Lining Technology
Size: Mythic Sleeping Bag: 20F Down
Shape: mummy
Degree: 20F
Zipper: 1/2-length
Activity: backpacking
Bag Length: regular, long
Insulation: 900-fill RDS-certified down, Grangers PFC-free hydrophobic finish

What people are saying

Reviewers consistently praise the Rab Mythic 20F for its exceptional warmth-to-weight ratio, crediting 900-fill-power goose down and a thin Pertex Quantum shell for keeping the bag ultralight and impressively packable. Build quality and durability also earn strong marks, with users noting minimal wear even after heavy use. The hydrophobic down treatment is appreciated for maintaining loft in damp conditions. The most common complaints center on the short, half-length zipper, which reviewers find prone to snagging and too restrictive for venting on warmer nights. The snug, tapered cut can feel constricting for larger users or side sleepers. Some cold sleepers also question whether the 20F temperature rating holds up in real-world conditions without base layers, and the high price is a recurring concern.