Big Agnes Lost Ranger 3N1 15° review

The Lost Ranger 3N1 15° is really two bags. The outer bag is a roomy rectangle for warm nights, the inner bag is a hooded side-sleeper shape for cooler ones, and together they reach an ISO comfort of 27°F and an ISO limit of 15°F. On its own the inner bag is rated at 49°F comfort and 41°F limit. Both use 650 fill DownTek PFC-free down, with offset quilting so the stitch lines do not line up when layered. The outer bag has a pad sleeve and a Pad Cinch System that ties the bag to your sleeping pad, plus a Pillow Barn that holds a pillow or jacket in place. Big Agnes lists the Small at 2 lb 7 oz in total and says a pad is required for proper use. At $399.95 it costs more than a single 15°F bag like the NEMO Disco, so it makes sense if you camp across seasons and want one purchase to cover them.

Who it is for

campers who want one bag from summer to late fall

Price

$399.95 for Small or Regular at the Big Agnes store when checked; Long $419.95.

Regular - $399.95
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Inner bag, outer bag, or both for three configurations
• ISO comfort 27°F and ISO limit 15°F combined
• 650 fill DownTek PFC-free down
• Pad sleeve keeps the bag on your sleeping pad
• Small size weighs 2 lb 7 oz in total

Strengths and weaknesses

• Strength: Three setups cover warm summer nights to frosty fall ones
• Strength: Pad sleeve and Pad Cinch System stop you rolling off the pad
• Strength: Inner bag design is based on Big Agnes's side-sleeper Sidewinder bag
• Weakness: Requires a sleeping pad, sold separately, for proper use
• Weakness: Two bags and four zippers take more effort than a single bag
• Weakness: Quilt-through construction on both layers

Key facts

• Price: $399.95 (Small or Regular)
• ISO comfort / limit: 27°F / 15°F combined
• Weight: 2 lb 7 oz (Small, both bags)
• Insulation: 650 fill DownTek PFC-free
• Pad sleeve: Yes, pad sold separately

Where it ranks

Big Agnes Lost Ranger 3N1 15° is No. 6 in our Best Sleeping Bags verdict.