What Our Gearhead Experts Are Saying:"I take the Synthesis 50 Sleeping Bag on summer backpacking trips when every ounce matters. It’s lightweight, compresses down small, and still provides enough warmth for cool nights in the backcountry. The synthetic insulation keeps performing even when damp, making it a reliable choice for unpredictable conditions. Plus, the zipper design lets me ventilate easily when temps rise."When we’re heading out on fast-and-light summer adventures, the Sierra Designs Synthesis 50 Sleeping Bag is our go-to for a comfortable night's rest. Its lightweight synthetic insulation provides just the right amount of warmth for mild nights, and it continues to perform even if moisture creeps into our tent or bivy. Designed for efficiency, the Synthesis 50 features a relaxed mummy shape that balances comfort with weight savings. A full-length zipper offers easy venting on warmer nights, while the included stuff sack keeps it compact in our pack. Whether we’re bikepacking, thru-hiking, or setting up camp under the stars, this bag keeps us sleeping soundly without weighing us down.