The RAB Mythic 600 is a down-filled sleeping bag designed for winter camping and mountaineering, offering reliable warmth in cold conditions. With a length of 215 cm, it’s intended for users up to about 185 cm tall, giving you enough space to move comfortably without excess bulk.
Rated to keep a woman comfortable down to –5 °C and a man to –12 °C, this bag uses 900 FP R.D.S. certified European goose down treated with a fluorocarbon-free hydrophobic finish to resist moisture and preserve loft. The shell and lining are both made from ultralight 7D Atmos™ nylon ripstop (23 gsm) with a durable water-repellent coating, which combines tear resistance with a low overall weight under 900 g. These details mean you get high thermal efficiency, packability and ruggedness without carrying extra grams.
Fill power measures how much volume one ounce of down occupies—the higher the number, the more air it traps for insulation. At 900 FP, this down delivers exceptional warmth per gram. Ripstop nylon is woven with reinforced threads to stop small tears from spreading, and a DWR finish causes water to bead and roll off the fabric, helping keep the down dry and effective.
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RAB says about the Mythic 600
The Mythic range is all about slashing weight wherever possible. The Mythic 600 is an extremely lightweight, four season bag. At home in high mountains, it’s ideal for venturing out long Alpine routes, multi-day climbs, treks or bike packing adventures.
Weighing in at just 885g, it contains 600g of 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, Atmos™ fabric. At just 7D with a built-in ripstop, it’s both ultra-light and super tough. It 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.