This incredible lightweight bag combines the tubular bell system with pre-cut anatomically formed baffles and ultra-light Asahi-Kasei Impact 66 rip-stop polyamide 40.7g/m2 fabric. With this miraculous potion, the Mirage keeps its loft even at the loftiest heights.

The 12.9oz (365 g) fill of 800+ cu in (EU) goose down keeps you snuggly warm in temperatures as low as -1C (31F), and its tiny pack size of a mere 4.8 litres (26.3oz/773g total) makes it the perfect bag to take up to a high camp on your way to the top. The secret of the Mirage’s success is that it only touches the upper body and has no contact with either your feet or legs: it simply hovers above them creating a vacuum that embraces the heat emanating from your body.