Big Agnes Echo Park 0

Backcountry.com says:
The Big Agnes Echo Park Sleeping Bag is an absolute luxury to sleep in when it's freezing outside the camping tent. Its zip-off quilt creates a 3-in-1 layering system. You can take the quilt out and use the sleeping bag like a regular mummy, or you can rely on the quilt solely for summertime backpacking trips. Together, the bag and quilt provide a 0F temperature rating with its protective synthetic insulation that stays warm even if it happens to get wet. The ripstop shell also has a water-resistant treatment for greater defense in wet climates.