Product InformationTraditionally, all of the lightest weight bags are made with the extremely light ripstop nylons. We created our Caribou to be lightweight, durable, and comfortable by using MicroLite XP. This 1 lb. 5 oz. mummy bag has a full length zipper and is cut wider than average for broader shoulders and a more comfortable fit. With its highly breathable taffeta fabric, the Caribou is a durable lightweight summer bag and a great choice for AT hikers. Caribou MF Sleeping Bag - 5'6" Left Zip