The RAB Ascent 500 W is a women’s mummy-style down sleeping bag designed for lightweight backpacking and camping through the cooler parts of spring to autumn. Its slim, tapered shape helps trap warmth close to your body while keeping bulk and weight to a minimum.
Inside you’ll find 500 grams of 650 fill-power R.D.S. certified duck down, which delivers a high warmth-to-weight ratio and compresses down small for easy packing. Both the shell and lining are made from Pertex® Quantum nylon, a fabric that sheds light moisture and resists abrasion to help the down maintain loft. It stows into a compact 22 x 39 cm pack size, so it slips neatly into most backpacks, and is rated to a comfort temperature of 0 °C for women (with a comfort limit of –6 °C for men), keeping you snug on chilly nights without extra bulk.
Fill power (650 FP) measures how much space one ounce of down occupies when allowed to loft; higher fill power means more insulating air pockets for less weight. The Responsible Down Standard (R.D.S.) certification ensures the down comes from ducks that were treated according to strict animal-welfare guidelines, so you get reliable performance backed by ethical sourcing.
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RAB says about the Ascent 500 W
The Ascent 500 is a versatile bag with a comfortable, wide mummy fit. Filled with 500g of 650FP goose down and with space for wearing additional layers if needed, this bag can be used in cool temperatures. Ideal for two season use and spring conditions similar to those in the UK, New Zealand or Scandinavia. The women’s specific shape is slightly shorter in length, narrower at the shoulders, and wider at the hips than the regular fit bag for improved efficiency. The Ascent is built with a lightweight and durable, recycled Pertex® Quantum outer fabric and recycled nylon lining. It has trapezoid shaped, boxwall baffles that stack neatly together, encouraging the hydrophobic duck down inside to loft fully and reducing the appearance of cold spots. 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. The generous mummy fit with wide foot box provide a spacious feel for an easy night’s sleep, and the close-fitting neck baffle keeps the heat in when the temperature drops. It has a ¾ length main zip with a down filled baffle to keep out the draught. Practicalities are taken care of with an internal zipped stash pocket that easily fits a phone or a headlamp, a cotton storage sack and a compression stuff sack to ensure a manageable pack size and protection on the road. Exploring with a partner or want extra space? Pick up a left and a right zipped bag and you can zip them together.