Big Agnes
Big Agnes Lost Ranger 3N1 15
No citable owner-review average published for this one, so no stars.
Two bags that nest: an outer 15-degree shell and an inner lighter bag, usable separately for summer, together for winter, or as a single mid-weight bag in between. It is the most flexible sleep system in this catalogue and also the heaviest way to buy that flexibility — 44.5 ounces for the pair. For a family or a couple who camp from June through October and want one purchase to cover it, the argument holds. For a backpacker it does not.
Label against lab
No ISO or EN rating is published for this one — the 15 °F is Big Agnes’s own figure, with no lab test behind it. Where a maker publishes loft or fill weight instead, those are the numbers worth comparing. What the standards measure
At that temperature the pairing table wants at least an R 5.5 pad underneath it.
Size run
One product, 3 sizes. The headline numbers on this page describe the Regular.
| Size | Weight | Approx. price | Length | Shoulder girth |
|---|---|---|---|---|
| Small | 2 lb 7.5 oz | ~$400 | — | — |
| Regular | 2 lb 12.5 oz | ~$400 | — | — |
| Long | 3 lb 1 oz | ~$420 | — | — |
Specifications
Highlights
Features
- Hydrophobic down
- RDS down
- Draft collar
- Full-length zipper
- Pad attachment straps
- Recycled fabric
What it does well
- Three configurations from one purchase: outer alone, inner alone, or both nested for the 15-degree rating.
- Cheaper than buying a summer bag and a winter bag separately, and lighter than carrying both.
- PadLok attaches the bag to a pad so it can't slide off in the night.
- 650-fill DownTek, RDS-certified and PFC-free, in a durable 20-denier recycled polyester shell.
What it costs you
- 44.5 ounces for the pair — nearly three pounds, and the system only makes sense when you carry both.
- No ISO or EN rating; the 15-degree figure is Big Agnes's own.
- $400 is a lot of money to commit to a system rather than to a single bag you have slept in.
- Neither fill weight nor shoulder girth is published.
Those two lists are drawn from Big Agnes’s published specifications and from reviews that measured them. They are not owner sentiment — anything owners said appears under its own heading below.
What owners say
No owner discussion has been collected for the Big Agnes Lost Ranger 3N1 15 yet. The pros and cons above come from Big Agnes’s published specifications and from reviews that measured them — nothing on this page claims owners said anything. How that works.
Others in the same band
More from Big Agnes →
Big Agnes
Big Agnes Torchlight EXP 20
Two zippered expansion panels run from shoulder to footbox and add five inches of girth on each side — ten inches in total — which makes this the only bag here whose fit you can change after you have bought it. Zip them shut on a cold night and it is a normal mummy; open them on a warm one and it is closer to a semi-rectangular bag. That is a genuinely good answer to the problem that a bag tight enough to be warm is too tight to sleep in. The trade is 40 ounces and a manufacturer-only 20-degree rating with no lab figure behind it.
Best for: Sleepers who want a mummy some nights and room on others
Full spec sheet
NEMO
NEMO Tempo 20
NEMO's entry synthetic bag: the Spoon shape and the Thermo Gills in a heavier 50-denier shell with a lower grade of Zerofiber, at $170. The 50D fabric is the real difference — it is a much tougher bag than the Forte, which matters more in a campground and on a car-camping trip than the 58-ounce weight does. Published ISO lower limit of 21 °F, honest for a bag with a 20 on the label.
Best for: Campground and car-camping trips in a wet climate
Full spec sheetA synthetic mummy with an ISO comfort rating of 24 °F for $189, built entirely from recycled fabric and fill. That comfort figure is the interesting part: at four degrees off its own name it is one of the most honestly labelled bags here, and it is warmer at the comfort end than several down bags costing three times as much. The price is three and a half pounds and a stuff sack the size of a football, which is why this is a car-camping and canoe-trip bag rather than a backpacking one.
Best for: Damp-weather camping on a budget
Full spec sheet