Canvasdale

Mummy sleeping bag

By the Canvasdale team · Last checked

A mummy sleeping bag is shaped to narrow from the shoulders to the feet, with a hood that closes around the head. The close fit leaves less air to warm, so these bags are often said to hold warmth better, though they give less room to move.

Where you'll see it

It is usually named in the product title or specification, and is often set against rectangular bags. Shape matters when you compare bags, because two bags with similar comfort ratings can feel very different at night if one is close fitting and the other roomy.

What to check

  • Whether the bag is described as mummy shaped, using the maker's own wording.
  • The length the maker lists, compared with your height, since a bag that is too long leaves cold air at your feet.
  • The room at the hips and shoulders, if you turn over or sleep on your side.
  • For children, whether the bag is shaped the same way and sized for them.
  • Sleeping bag liner: a thin inner bag that can add a little warmth and keep the bag clean.
  • Loft: the thickness of fill that traps warm air.
  • Comfort rating: the figure to compare bags by, whatever their shape.

Read more: sleeping bag temperature ratings explained and, if one fits, the sleep system builder.