The lightest of all the Sea to Summit Trek sleeping bags, the Sea to Summit Trek Tk I Sleeping Bag is ideal for camping in the summer or traveling to temperate climates. The full length zipper allows the bag to be fully opened up for use as a comforter in mild temps.Features: Down: ULTRA-DRYDown 650+ Loft 85% Down Cluster Premium Duck Down Season ratings: Indoor/Summer Compressed volume: 5.1 Liters - Regular Compression bag: Small - 10 to 3.3 Liters Specs:Size Variation: Regular/Left Zip Compressed Size: 5.1 liter Fill Weight: 12.4 ozBag Weight: 1 lb 12 ozTemp Rating: 32 F (EN Lower Limit)/0 C (EN Lower Limit) Color: Orange