The Napsack has zippers at the shoulders, so you can stick your arms out, and a cinch at the bottom so that you can open it up and stick your legs out. Hike it up to your waist, cinch it, and wear it like a puffy coat around the campfire, and then crawl right back into your tent without ever having to leave the warmth of your bag.
The chest pocket fits a phone and has a pass through hole for your headphones to run internally, and it has pockets like a puffy jacket.
All packed up in the stuff sack the medium Napsack comes in at 18″ by 8″ add a few inches in length for the large Napsack. If you throw it inside a compression sack it easily goes down to 8″ x10″
Small: 55″ body, 14″ hood, 17.5″ wide at shoulder
Medium: 68″ body, 14″ hood, 19.5″ wide at shoulder
Large: 76″ body, 14″ hood, 23.5″ wide at shoulder
Fabrication: Synthetic. Soft Microfiber body, leather tabs to cinch the hood. Rated to approximately 50 degrees.