Inspired by tried-and-tested clothing layering systems, we created the One Bag. This is a sleeping system, comprised of two sleeping-bag ‘layers’ allowing you to customise your insulation. The top layer harnesses Heatseeker™ Pro synthetic insulation, made from 50% post-consumer polyester, to provide summer-weight warmth down to 5C. The synthetic filling continues to insulate even when damp, so ideal for humid conditions. The inner layer is filled with 800-fill RDS ProDown™ to offer lightweight warmth in dry conditions down to -7C. It can also be used as a cosy blanket for marshmallow campfire sessions. Then use the two together when you need more powerful insulation down to -15C. Oh, and the compression sack has a fleece lining, so flip this inside-out for a comfy camp pillow. With this one sleeping bag system you’re covered for a temperature range from 5C to -15C and conditions spanning warm and humid to cold and dry. If versatility is what you’re after, the One Bag is a great choice.