Ultralight Waterproof 4-Season Envelope Sleeping Bag | Backpacking & Travel

The envelope cut is the most versatile sleeping bag geometry — it sleeps roomier than a mummy, unzips fully as a blanket, and pairs easily with a second bag. This ultralight waterproof version covers all four seasons without the weight penalty that usually comes with year-round ratings.

What's Included:

•       Envelope cut — rectangular shape allows full-body movement, unzips to a full blanket

•       4-season waterproof rating — coated outer shell resists moisture from condensation and light rain

•       Ultralight construction — significantly lighter than standard envelope bags at comparable temperature ratings

•       Full-length dual zipper — zip from top or bottom for ventilation control

•       Compression carry bag — packs down for backpack transport

Perfect For:

Backpackers who prioritize versatility over mummy-cut warmth efficiency. Travelers who use their sleeping bag as both a bag and a camp blanket. Campers who want one bag that covers the full season calendar.