Poler Men's The Reversible Napsack Wearable Sleeping Bag 100% Nylon Imported Machine Wash 7" high 11" wide Sizing: Small fits up to 5' tall, Medium fits up to 5'8 tall, Large fits up to 6'3 tall, and X-Large is for giants Featuring Super Duper Thermastuff insulation for cozy warmth - rated to approximately 50 degrees 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". 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 Soft microfiber body Leather cinch tabs Walk by pulling the bottom hem up through the inside of your knapsack and cinch the drawstring around your waist to enter your walk mode Lounge by unzipping the arm holes from the inside, allowing you to read a book, use the computer, watch a movie and more, all from the cozy comfort of your knapsack Sleep by zipping up the armholes (from the inside) and cinch the bottom drawstring for maximum warmth for sleep mode Polerstuff | Polergoods