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Rab Ascent 900 Sleeping Bag

An excellent value sleeping bag suitable for temperatures around -10ºC and made with 650 US fill power duck down and Pertex® inner and outer fabric.


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  • Left Zip, Red or Rococco
  • £252.00
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  • Right Zip, Red or Rococco
  • £252.00
  • 1 in stock
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!


With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery Dates

Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

The Current Estimated Delivery Dates for Rab Ascent 900 Sleeping Bag is

Rab Ascent 900 Sleeping Bag Description

  • Brand : Rab
  • Season : Not Applicable
  • Code : RAB ASCENT900
  • Packaged Weight : 3KG
  • NB Rab have change the colours of these sleeping bags - please see photos for old and new, the new being the somewhat drabber colours. In all other respects they are unchanged. We have a mixture of stock so please tell us if the colour is important when you order and we'll see what we have.

    An excellent value sleeping bag suitable for temperatures around -10ºC and made with 650 US fill power duck down and Pertex® inner and outer fabric.

    The Ascent range of sleeping bags from Rab are duck down filled performance sleeping bags designed for regular use. The bags use durable and lightweight Pertex Microlight fabrics. These bags offer fantastic value for money, quality build and construction, durability and low weight for warmth of the bags. the bags are designed in a semi rectangular shape that is more user friendly for general purpose use or for those buying their first down bag.

    • Pertex® Quantum (was called Microlight) inner and outer fabric.
    • 900g of 650 US Fill Power European Duck Down.
    • Rab® fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax®.
    • Wide mummy shape.
    • Proportionally assigned differential cut.
    • Internal YKK 3 coil zipped stash pocket.
    • Wide foot area for extended comfort.
    • ¾ length YKK 5 coil main zip.
    • Left and right hand zips available.
    • Left and right hand zips will zip together.
    • Anti snag zipper webbing tape.
    • Internal collar and hood drawcord.
    • Improved close fitting neck baffle design.
    • Trapezoidal baffle chamber design.
    • Angled foot box.
    • Cotton storage sack.
    • Hand filled in Derbyshire UK.

    Buyers Guide

    Rab Ascent 900
    Fill: 900g 650 US fill power European duck down
    Comfort Limit:
    ca -10ºC *
    weight 1510g
    * EN Temperature Rating are not given for bags rated below -25ºC so the Comfort Rating is an estimate.
    EN Sleeping Bag Temperature Ratings
    EN13537 is the European standard for sleeping bags and requires a thermal manikin test which produces four temperature results — upper limit, comfort, lower limit and extreme. There is no legal obligation to use this standard though most reputable brands do, even non-European ones. There is an exemption for military sleeping bags and sleeping bags for extreme temperatures, ie a comfort range of below -25°C. 
    Upper Limit: the temperature at which a standard man can sleep without excessive perspiration. It is established with the hood and zips open and with arms outside the bag.
    Comfort: the temperature at which a standard woman can expect to sleep comfortably in a relaxed position.
    Lower Limit: the temperature at which a standard man can sleep for eight hours in a curled position without waking.
    Extreme: the minimum temperature at which a standard woman can remain for six hours without risk of death from hypothermia (though frostbite is still possible).
    For the purpose of these measurements, a "standard man" is assumed to be 25 years old, with a height of 1.73m (ie 5' 7", not very tall) and a weight of 73kg; a "standard woman" is assumed to be 25 years old, with a height of 1.60m (ie 5' 2.5") and a weight of 60kg.

    Sizing Information

    Rab Ascent internal length shoulder width hip width foot width
    Regular 185cm (6' 1") 75cm 65cm 50cm
    Long 200cm (6' 7") 75cm 65cm 50cm
    Women's 170cm (5' 7") 73cm 67cm 50cm


    Technical Information

    Rab Ascent 900 Sleeping Bag
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