The Robens Serac Lite 300 Sleeping Bag is a standard mummy profile with a 600 down fill power in a box wall construction providing the best warmth-to-weight ratio for most general outdoor pursuits. It is very compressible thanks to the quality down filling, making for a small pack size, and comes with a compression stuff sack for optimal storage on tour and at home. Serac Lite 300 Sleeping Bag