Big Agnes Lost Ranger 3N1 Sleeping Bag (0°F) – 3-Season, Regular, 650 DownTek

Triple-configurability for changing conditions

The Lost Ranger 3N1 is a modular sleeping system that adapts from warm nights to cold mornings on the trail. Designed to stay attached to your pad, it helps you maintain your preferred sleep position without shifting surface through a range of temperatures and trip lengths.

Three setups in one bag

Outer bag alone for warm summer nights; inner bag on its own for cooler evenings; both bags together for maximum warmth on cold trips. This flexible design delivers three reliable configurations in one compact system, ideal for 3-season camping and versatile backpacking.

• Outer bag only: light and breathable for warm nights.
• Inner bag only: compact warmth when temperatures drop.
• Both bags: maximum warmth with offset quilting to minimize cold spots.

Comfort and movement engineered in

The Padlock Sleep System secures the outer bag to your sleeping pad, helping you stay centered on the surface while you move. The Pad Cinch System adapts to various pad sizes with a self-equalizing drawstring and a middle securement. The inner bag follows a design that accommodates side sleepers and moves with you as you shift.

• Secure pad connection supports uninterrupted sleep on uneven ground.
• Adaptive cinching fits most standard pads and keeps layers in place.

Warmth with responsible materials

650 fill DownTek insulation provides loft and warmth, with performance retained even when damp. Bluesign-approved water-repellent finishes and PFAS-free construction align with sustainable design. The outer bag shell and pad sleeve use recycled 20D polyester ripstop, while the inner bag lining is recycled polyester taffeta with water repellency.

• DownTek insulation delivers warmth in damp conditions.
• PFAS-free finishes and bluesign-approved materials reduce environmental impact.

Practical features at a glance

Two-way zippers permit easy temperature control from top or bottom. A pillow barn on the pad sleeve keeps a pillow or jacket in place, while a mesh storage sack and a compact stuff sack simplify storage and transport. For smaller packs, pair with a compression sack or a lightweight girdle (sold separately).

• Two-way zippers for flexible ventilation and climate control.
• Pillow barn plus multiple storage options support organization and comfort.

Fit and care

Regular size offers balanced coverage for most campers. With modular layers, this system supports a wide range of trips from car camping to backcountry treks. When storing between trips, use a breathable mesh bag to preserve loft and shape.