Mythic 200 Down Sleeping Bag

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UOG TOP PICK—Ultra-lightweight with a highly tapered cut, the Mythic 200 is designed for summer, alpine style missions where weight and pack size are crucial to success. Filled with 900FP goose down and covered with a lightweight recycled Atmos fabric, it’s a high-performance bag for those meticulously counting grams.

Rab says: 

The Mythic range is all about slashing weight wherever possible. The Mythic 200 is an extremely lightweight spring and summer bag. At home in high mountains, it’s ideal for venturing out on long Alpine routes, multi-day climbs, treks, or bikepacking adventures.

Weighing in at just 515g, it contains 200g of ultra-high lofting, 900FP goose down. The chevron style baffle design keeps the down in position, optimising core warmth and reducing the amount of fabric needed compared to traditional horizontal baffles. The outer is made from our own wind- and water-resistant, recycled Atmos™ fabric. The bag has a narrow mummy shape to minimise bulk, lightweight zips and pullers, and comes with a lightweight, waterproof, roll-top compression sack for protection from the elements and a small pack size while on the move.

The trapezoid boxwall baffle construction allows the down to fully loft, eliminates cold spots, and maximises warmth. It has an additional, adjustable baffle around the neck and an internal baffle along the length of the zip, both designed stop the heat from escaping. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth.

Our Verdict

For those who prioritise ultralight gear, the Rab Mythic 200 Down Sleeping Bag is a standout option for summer alpine adventures. Weighing in at just 515 grams, this sleeping bag is filled with 900FP goose down, ensuring high loft and superior warmth without the weight. The chevron baffle design optimises core warmth while minimising fabric usage, and the recycled Atmos™ fabric shell offers excellent wind and water resistance, making it a reliable choice for high mountain conditions.

The Mythic 200’s highly tapered mummy shape and thoughtful features like the adjustable neck baffle and internal zip baffle prevent heat loss, ensuring a warm night’s sleep even in cooler temperatures. The lightweight, waterproof roll-top compression sack provides excellent packability, keeping the sleeping bag compact and protected from the elements. Ideal for multi-day climbs, treks, or bikepacking, the Rab Mythic 200 combines sustainability with top-notch performance, making it an essential gear for weight-conscious adventurers.

– Reviewed by Ultralight Outdoor Gear

Features

• Weight saving chevron baffle design, reduces down migration and optimises core warmth.
• Trapezoidal boxwall construction with differential cut, to maximise loft and warmth
• Close fitting adjustable neck baffle design for decreased heat loss
• YKK® 3/4 length main zip with synthetic filled baffle to trap warmth
• YKK® zipped internal stash pocket
• Angled foot box for relaxed sleeping posture
• Anti-snag bonded zip guard
• Lightweight waterproof roll-top compression sack included

Specifications

• Regular weight: 568g (ecluding storage bags)
• Rab Sleep Limit: 1°C (34°F)
• ISO EN: Comfort: 7°C, Limit: 1°C, Extreme: -12°C
• Sleeping Bag Length: (reg) 215cm / 84.6in
• Max User Height: (reg) 185cm / 72.8in
• Internal Shoulder Girth: (reg) 160cm / 63.0in
• Internal Hip Girth: (reg) 134cm / 52.8in
• Internal Foot Girth: (reg) 102cm / 40.2in
• Packed Size: 31 X 17cm / 13.8 x 9.1in

Material & Construction

• 10D Recycled Atmos™ (27gsm) with Fluorocarbon-Free DWR
• 10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)
• 900FP European Goose Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (200g / 7.1oz)

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Rab
• Rab Mythic Sleeping Bag Range Explained
• Rab Sustainability and Responsibility
• Down Quality
• All About Down
• Hydrophobic Down
• Recycled Content in Outdoor Gear