The Ultralight Cotton Mummy Sleeping Bag Liner is the compact, lightweight sleep upgrade that earns its place in every pack. At just 360g and packing down to a tiny 19 × 9 cm, it adds warmth and hygiene without adding meaningful weight. The cotton fill delivers soft, breathable insulation rated for 5°C to 15°C — i for spring, summer, and early autumn use as a standalone bag or as a liner inside a heavier sleeping bag for colder conditions. At 200 × 80 cm, it fits adults up to 1.8 m comfortably. The mummy cut keeps the liner in place throughout the night, and the splicing zipper lets you connect two liners for a double configuration when you need more space. Specifications Specification Detail Style Mummy Filling Cotton Temperature Rating 5°C to 15°C Season 3-Season (Spring, Summer, Autumn) Unfolded Size 200 × 80 cm Packed Size 19 × 9 cm Net Weight ~360g Suitable Height Up to 1.8 m Splicing Yes – single or double configuration Applicable Users Adults Available Colors Khaki, Light Blue, Orange, Dark Gray Why Choose This Ultralight Liner? Featherlight at 360g: Adds warmth and hygiene without meaningful pack weight — i for ultralight backpackers and minimalist travellers. Packs to 19 × 9 cm: Smaller than a water bottle — fits in any pack pocket, travel bag, or emergency kit. Soft Cotton Fill: Breathable and gentle against skin — more comfortable than synthetic liners for extended use. Dual-Purpose Use: Standalone bag in mild weather or liner inside a heavier bag for colder conditions — one piece of gear, two functions. Splicing Compatible: Connect two liners for a double sleeping bag configuration. I For Spring, summer, and early autumn camping trips Travel and hotel use as a hygienic sheet liner Boosting warmth inside a heavier sleeping bag Ultralight backpackers who count every gram In the Box 1 × Ultralight Cotton Mummy Sleeping Bag Liner 1 × Compression carry bag