| What kind of insulation does it use: Synthetic or down?
Bags will lose their loft over time. Synthetics lose it quicker than down, especially if stored inside the stuff sack.
If a synthetic bag has been exposed to heat (like storing in a hot attic) while compressed, the fibers can fuse together and lose loft.
Washing is probably the only way of salvaging lost loft.
Wash the bag by hand or in a front loading machine on gentle cycle (use non-detergent soap, use down wash if down). Rinse it thoroughly. Put it in the drier in low heat with a few tennis balls.
If that doesn't help... I don't think there's anything else you could do.
Good luck!
-Doug
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