The lightest of all the 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 Trek Tk I 's 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 Length/Zip: Long - left zip Season ratings: Indoor/Summer Compressed volume: 5.1 Liters RegularCompression bag: Small - 10 to 3.3 Liters Specs: Size Variation: Long/Left ZipCompressed Size: 5.1 liter Fill Weight: 14.1 ozBag Weight: 2 lbs Temp Rating: 32 F (EN Lower Limit) /0 C (EN Lower Limit) Color: Orange