Sleeping bag
Overview
A sleeping bag is an insulated, typically zippered sleep system component designed to retain body heat during rest. It is a core part of most backpacking shelter systems.
Key points
- Provides insulation around the body during sleep.
- Uses down or synthetic fill materials.
- Rated to approximate temperature ranges under standardized tests.
- Weight, compressibility, and shape vary by design.
- Works in combination with a sleeping pad and shelter.
Details
Sleeping bags create an insulated envelope around the sleeper, reducing heat loss to surrounding air. Common designs include mummy bags with hoods, rectangular bags, and hybrid shapes. Fill materials are typically down or synthetic fibers, each with distinct properties relating to weight, moisture response, and compressibility.
Temperature ratings provide a reference for expected performance, though comfort levels vary by individual metabolism, clothing, shelter, and other factors. Many labels distinguish between comfort and lower-limit ratings, allowing users to make more nuanced comparisons.
Selection of a sleeping bag involves balancing warmth, weight, packed size, price, and durability. Some hikers choose slightly warmer bags for shoulder seasons or routes with greater temperature uncertainty; others prefer lighter options combined with clothing layers.
Sleeping bags are most effective when paired with appropriate sleeping pads, which address heat loss to the ground, and with shelters that mitigate wind and precipitation.
Related topics
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