Less zip, more zzzzzz…

Aside from relatively small details, sleeping bag design doesn’t change much. But Sierra Designs’ Cloud 800 (£335) does away with a major component: the zip. Instead, an integrated ‘comforter’ tucks into an internal pocket, wrapping the sleeper in a cosy insulated blanket. Sierra Designs says this reduces weight, is more adaptable to a range of temperatures, and offers a less restrictive night’s sleep with more of the feel of home bed comfort.