How to Clean and Care for Your Down Sleeping Bag

By Kammok: High Performance Gear to Elevate Camp | Published: 2026-10-24

Category: Tips & Care

Learn the right way to wash, dry, and store your down sleeping bag to maintain its loft, warmth, and longevity. Includes tips for the Kammok Ursa Sleep System.

Quick answer

Clean your down sleeping bag with a gentle down-specific detergent, dry it on low heat with dryer balls to restore loft, and store it uncompressed in a large cotton sack to prevent clumping and odor.

Why down needs special care

Down insulation traps air to keep you warm, but it loses loft when it gets dirty, wet, or compressed. Oils from your skin, campfire smoke, and trail dust can clog the down clusters, reducing their ability to insulate. Proper cleaning removes those contaminants and restores the bag's performance. The Kammok Ursa Sleep System uses high-quality down that responds well to careful washing.

When to wash vs. spot clean

You don't need to wash your down bag after every trip. Spot cleaning with a damp cloth and mild soap works for small stains. Wash the entire bag only when it loses noticeable loft, smells musty, or has visible dirt buildup. Over-washing strips natural oils from the down and can shorten its life.

How to wash and dry your down sleeping bag

1. Prepare the bag and washer: Close all zippers and fasten any straps. Place the bag in a front-loading washer (top-loading agitators can tear the fabric). Use cold or warm water on a gentle cycle. Add a down-specific cleaner—never standard detergent, which strips natural oils. Skip fabric softener; it coats the down and ruins loft.
2. Run an extra rinse cycle: After the wash cycle finishes, run an extra rinse or spin cycle to remove all soap residue. Leftover soap attracts dirt and reduces insulation performance. Residue is the most common cause of clumpy down after washing.
3. Dry on low heat with dryer balls: Transfer the damp bag to a large dryer. Set it to low heat and add two to three clean tennis balls or wool dryer balls. The balls break up down clumps and restore loft. Stop the dryer every 30 minutes to fluff the bag by hand. High heat can melt the shell fabric. Patience is key—drying can take 2–4 hours.
4. Check for remaining clumps: When the bag feels dry and fluffy, check for any remaining down clumps by pinching the baffles. If you feel hard lumps, the down is still damp. Continue drying in 20-minute increments until all clumps are gone. Damp down loses loft and can develop mildew. Don't rush this step.
5. Store uncompressed in a cotton sack: Once fully dry, store the sleeping bag loosely in a large cotton or mesh storage sack. Never leave it compressed in its stuff sack for more than a few days. Long-term compression permanently damages down clusters. A cotton storage sack lets the bag breathe and keeps it lofty between trips.

Product facts

Ursa Sleep System: The Ursa Sleep System comes in two sizes: standard Ursa for taller campers and Ursa Minor for a smaller footprint. It has built-in asymmetric zippers for seamless integration between components. When washing, the integrated zippers and baffles need gentle handling to avoid damage. The two size options mean you can choose a bag that fits your gear wash space.
Ursa Sleep System