Mammoth Double 20°F: Cleaning and Storage Guide

Quick answer

Clean your Mammoth Double 20°F sleeping bag with a gentle, front-loading machine wash using mild soap, then dry on low heat. Always store it loosely in a large cotton sack to protect the insulation.

Step-by-step cleaning and storage guide

1. Prepare the bag for washing: Unzip the Mammoth Double completely and shake out any debris. Spot-clean stains with a mild detergent and a soft cloth. Close all zippers to prevent snagging. Common mistake: Washing with zippers open can tear the fabric or damage the draft tube.
2. Wash in a front-loading machine: Use a large-capacity front-loading washer. Set to a gentle cycle with cold or warm water. Add a small amount of a gentle, non-detergent soap designed for down or synthetic insulation. Avoid top-loaders with agitators. Checkpoint: Do not use fabric softener or bleach—they break down insulation and reduce loft.
3. Rinse thoroughly and dry: Run an extra rinse cycle to remove all soap. Transfer to a large dryer on low heat. Add two clean tennis balls or dryer balls to fluff the insulation. Check for dryness every 30 minutes; it may take 2–3 cycles. Common mistake: High heat can melt synthetic fibers or shrink the shell fabric. Always use low heat.
4. Store loosely in a breathable sack: Once fully dry, fold or roll the bag loosely and place it in a large cotton or mesh storage sack. Keep it in a cool, dry place away from direct sunlight. Never store it compressed in the stuff sack for more than a few days. Checkpoint: Compression storage crushes the insulation, reducing warmth and shortening the bag's lifespan.

Product fact

• Mammoth Double 20˚F: The Mammoth 20°F Sleeping Bag features durable double-layer construction, high-performance insulation, and draft tubes to trap heat. These features mean the bag is built to hold warmth, but they also require careful washing to avoid damaging the insulation layers and draft seals.