From REI:

The REI Siesta +35°F double sleeping bag brings the creature comforts of home to the campsite or cabin. This roomy bag provides warmth and comfort for 2 happy campers.

• Barrel shape provides generous interior volume, making it ideal for those who prefer a roomy fit
• Hollow-core insulation delivers a balance of compressibility, warmth and durability; continues to insulate when wet and dries quickly
• Ripstop nylon shell is abrasion- and tear-resistant for years of use
• Shell fabric is treated with a Durable Water Repellent finish to repel moisture and stains
• Brushed polyester knit lining offers the softness of your favorite T-shirt with the moisture-wicking properties of a high-tech fabric
• Layered offset quilt construction eliminates cold spots
• For sharing the load, bag zips apart to become 2 bags; bags can be used separately or connected to another Siesta sleeping bag/sheet (sold separately) for customized comfort
• Full side and bottom zipper access; zippers are backed by wide, antisnag binding tape
• The REI Siesta +35°F double sleeping bag includes a cotton storage bag