A sleeping bag is the one piece of camp gear you cannot fake your way around: too cold and you will not sleep, too heavy and you will not want to carry it. Three numbers settle the decision: temperature rating, fill type, and shape. Here is how to read them.
1. Temperature rating: buffer down
Ratings lean toward survival, not comfort, so pick a bag rated about 10 degrees colder than the lowest night you expect. A 20-30F bag covers most three-season camping. If you sleep cold or camp in the shoulder seasons, size colder. A versatile MalloMe cold-weather sleeping bag (4.5 stars, 16,000+ ratings) is an easy first three-season bag.
2. Fill: down vs synthetic
- Down is lighter, packs smaller, and lasts longer, but loses warmth when wet and costs more. Best for backpacking and dry climates.
- Synthetic is cheaper and keeps insulating when damp, at more weight and bulk. Best for budget, wet trips, and car camping. A packable lightweight synthetic backpacking bag (4.5 stars, 10,000+ ratings) is a forgiving starting point.
3. Shape: mummy vs rectangular
Mummy bags taper to your body so there is less dead air to heat, which makes them warmer and lighter for backpacking. Rectangular bags are roomier and more comfortable for car camping where weight does not matter. If you toss and turn, look for a semi-rectangular cut.
4. Match it to a pad
Half your warmth comes from under you, not over you. A sleeping pad with enough insulation (its R-value) stops the ground from stealing heat, and a small compressible camp pillow (4.4 stars, 24,000+ ratings) finishes the system. A warm bag on a thin pad still sleeps cold.
See where the sleep system fits in the bigger picture in your first backpacking kit, or browse options in camping.
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