Sleeping Bags
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Sleeping bags are chosen by temperature rating, insulation and shape. Ratings usually include a comfort and a lower limit temperature; the comfort figure is the more realistic guide for most sleepers. Down insulation, described by fill power, gives the most warmth for its weight and packs small but loses loft when wet unless treated. Synthetic insulation is heavier and bulkier but keeps insulating when damp and is easier to wash.
Shapes include mummy bags that taper to save weight and hold heat, rectangular bags with room to move for car camping, and backpacking quilts that skip the back insulation and rely on the pad underneath. Liners add a little warmth and keep the bag clean.
Your sleeping pad matters as much as your bag. A pad's insulation rating describes how well it stops heat loss to the ground. Pair a warm bag with a pad suitable for the season, especially on snow or cold ground.
Choosing a sleeping bag
- Use the comfort rating, not the lower limit, and pick a bag a little warmer than the coldest night you expect.
- Choose down for low weight and packed size, synthetic for damp conditions and easy care.
- Check length and shoulder girth — a bag too tight compresses insulation, too loose leaves cold space.
- Pair it with a sleeping pad rated for the season.
- For used bags, ask how it's been stored and washed; long-term compression can reduce loft.
- Ask about responsibly sourced down if that matters to you.
Questions about sleeping bags
What temperature rating do I need?
Look at the comfort rating and choose one at or below the lowest temperature you expect. Cold sleepers should go warmer still.
Is a quilt as warm as a sleeping bag?
A quilt can be as warm for its weight because it leaves out the insulation you compress underneath you. It relies on a good sleeping pad and suits side sleepers who move around.
How should I store a sleeping bag?
Store it loose in a large storage sack or hung up, not compressed in its stuff sack, so the insulation keeps its loft.