Best overall three-season bag
Western Mountaineering UltraLite 20°
Best for: Most backpackers, most trips
20 °F bag with 850 FP down, tapered mummy, and a hood that seals.
Research pending — no verified product page yet
Buying guide
Sleeping bags buyer's guide
A sleeping bag is an insulated body-length envelope rated for a specific comfort temperature, using either down (700–950 fill power) or synthetic (Climashield, Primaloft) insulation.
By Wild10 Editors · Fieldcraft desk · Updated 7/16/2026
What we mean by this category
A sleeping bag is an insulated body-length envelope rated for a specific comfort temperature, using either down (700–950 fill power) or synthetic (Climashield, Primaloft) insulation.
Who this equipment is for
Backpackers, campers, and expedition travellers who need a rated sleep system that packs to a predictable size and weight.
Important buying criteria
- Rating
Buy for the coldest night you'll actually sleep in, minus one layering safety margin (roughly 5 °C).
- Fill
Down: warmer per ounce, useless when wet. Synthetic: heavier, works when wet, cheaper.
- Fit
Mummy for weight; semi-rectangular for comfort; wide/long options for large sleepers.
- Shell
Pertex or DWR-treated ripstop for down; sil-coated nylon for humid coastal use.
Use-case decision table
| Season | Rating (comfort) | Fill | Shape |
|---|---|---|---|
| Summer, low elevation | 0 °C / 32 °F | Down 800 FP | Semi-rectangular |
| Three-season | -7 °C / 20 °F | Down 850 FP | Mummy |
| Cold-wet coastal | -7 °C / 20 °F | Synthetic | Mummy |
| Winter | -18 °C / 0 °F | Down 850 FP | Mummy with draft collar |
Material or technology comparison
| Insulation | Warmth/oz | Wet performance | Pack size | Cost |
|---|---|---|---|---|
| Down 800 FP | Excellent | Poor | Small | $$$ |
| Down 950 FP | Best | Poor | Smallest | $$$$ |
| Synthetic Climashield | Good | Excellent | Larger | $$ |
| Synthetic Primaloft Gold | Good | Excellent | Larger | $$ |
Climate and season considerations
Humid coastal winters degrade untreated down within a trip. Choose hydrophobic-treated down or synthetic. In dry cold, treat rated temperature as a ceiling — layer a bag liner and dry socks.
Size, fit, or capacity guidance
Buy 4 in longer than your height. Draft tubes and collars matter as much as fill weight below freezing. A wider bag needs more insulation to reach the same warmth.
Editorial picks
Best value
Kelty Cosmic Down 20
Best for: First serious backpacking bag under $250
650 FP down with a durable ripstop shell.
Research pending — no verified product page yet
Best premium expedition bag
Feathered Friends Snowbunting EX 0°
Best for: Multi-week winter and expedition use
Hand-built in Vermont, 850 FP down, oversized draft collar.
Research pending — no verified product page yet
Best for beginners
The North Face Cat's Meow 20°
Best for: First-time campers not sure about season length
Synthetic fill, 20 °F comfort, easy to wash and forgiving of wet packing.
Research pending — no verified product page yet
Best canoe / raft bag
Enlightened Equipment Revelation Apex
Best for: Water trips where the bag will get damp
Synthetic Climashield holds warmth after a splash and dries fast in camp.
Research pending — no verified product page yet
Best ultralight quilt
Enlightened Equipment Revelation Quilt
Best for: Weight-first thru-hiking
Backless quilt sheds ounces without losing top warmth.
Research pending — no verified product page yet
Product comparison table
Verified comparison data for these picks is still being gathered — pick reasoning is published above.
Head-to-head comparisons
Related skills
Related field guides
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Frequently asked buying questions
- Down or synthetic?
- Down for dry cold; synthetic for humid, wet, or beginner conditions where you might pack it damp.
- Are quilts warm enough for winter?
- Quilts work down to about -7 °C with a good pad and strap system. Below that, a hooded mummy is safer.
Editorial methodology
How we chose these picks
Temperature ratings reflect EN/ISO 23537 comfort where available. Where a manufacturer publishes only limit ratings, we adjust down by roughly 5 °C for planning.