At just 680g, the Ultralight Envelope Sleeping Bag is the kind of gear that disappears into your pack and reappears exactly when you need it. Rated for comfortable temperatures from 9°C to 15°C, it’s the i 3-season companion for spring, summer, and autumn camping, hiking, and travel — light enough to forget you’re carrying it, warm enough to sleep soundly. The double-sided zipper lets you open the bag fully and use it as a blanket, while the 4-compression-strap stuff sack packs it down to a compact 29 × 12 cm for effortless transport. The splicing zipper connects two bags for a double configuration when you need more space. Specifications Specification Detail Model LW180 Style Envelope (Square) Filling Polyester Outer Fabric Nylon Lining T/C Blend Temperature Rating 9°C (limit) to 15°C (comfort) Season 3-Season (Spring, Summer, Autumn) Unfolded Size 190 × 75 cm Packed Size 29 × 12 cm Weight 680g Suitable Height Up to 1.8 m Zipper Double-sided Splicing Yes – connects to another bag Available Colors Army Green, Orange, Blue, Dark Blue, Wine Red Applicable Users Adults Why Choose This Ultralight Sleeping Bag? Featherlight at 680g: One of the lightest sleeping bags in its class — i for ultralight backpackers and minimalist campers who count every gram. Double-Sided Zipper: Open fully to use as a blanket at camp, or zip up for a traditional sleeping bag — two functions in one piece of gear. 4-Compression-Strap Stuff Sack: Packs down to 29 × 12 cm — small enough to fit in a side pocket, ready to deploy in seconds. Splicing Compatible: Connect two bags for a double sleeping bag — for couples or anyone who wants extra room. Breathable T/C Lining: Soft and breathable against skin, regulating temperature for a comfortable night’s sleep in mild conditions. I For Spring, summer, and autumn camping trips Ultralight backpacking and day-hike overnights Festival camping and outdoor travel Couples camping (splicing two bags together) Campers who want a bag that doubles as a blanket In the Box 1 × Ultralight Envelope Sleeping Bag 1 × Compression stuff sack (4-strap)