Three-Season Bags and Quilts Under $350
Three hundred and fifty dollars is roughly where the mainstream stops and the cottage and premium brands begin, and the interesting thing about the bags below that line is how many of them publish proper lab ratings. The expensive end of this catalogue is dominated by makers who publish nothing but their own number; the affordable end is where ISO figures are normal.
How this list is orderedBags and quilts under $350 rated to 35 °F or colder, ranked by the coldest published figure — lab comfort rating where one exists. 10 entries qualify.
- 1
NEMO
NEMO Disco 15
16 °F lab rating
2 lb 11 oz · ~$300 · Backpacking bag
The Spoon shape is NEMO's one genuinely original idea in sleeping bags: extra room cut in at the elbows and knees and taken back out at the shins, so a side sleeper can bend a leg without fighting the bag. If you have ever woken up wrapped in a mummy bag that rotated with you, this is the fix. The Disco is the 650-fill version — heavier and bulkier than the 800-fill Riff above it, and $100 cheaper. NEMO publishes an ISO lower limit of 16 °F but no comfort figure, which is the standard half-disclosure across this brand's line; assume comfort lands roughly ten degrees warmer.
- 2
NEMO
NEMO Forte 20
18 °F lab rating
3 lb 5 oz · ~$200 · Backpacking bag
The synthetic Spoon bag, and the right recommendation for anyone camping somewhere persistently damp — the Pacific Northwest, the Appalachians in spring, anywhere a down bag spends a week slowly losing loft. Zerofiber is made entirely from post-consumer recycled polyester, and it keeps insulating wet, which down does not. The cost is real: 53 ounces and 10.6 litres of pack space, roughly a quarter more weight and 60% more volume than the down Disco at a similar rating.
- 3
Enlightened Equipment
Enlightened Equipment Revelation 20
20 °F, maker's own
1 lb 7.6 oz · ~$345 · Quilt
The quilt that made quilts mainstream in America. Enlightened Equipment builds every Revelation to order in Minnesota across five lengths, four widths, six temperature ratings, two fill powers and three shell deniers, which is thousands of combinations and the reason this entry lists one representative build rather than a size run. The Revelation's distinguishing feature against the otherwise-identical Enigma is a zippered and drawcord footbox that opens completely flat, so the same quilt covers a 20-degree night and a 60-degree one.
- 4
NEMO
NEMO Tempo 20
21 °F lab rating
3 lb 10 oz · ~$170 · Camping bag
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.
- 5
Marmot
Marmot Trestles Elite Eco 20
24 °F lab rating
3 lb 8.4 oz · ~$189 · Camping bag
A 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.
- 6
Zenbivy
Zenbivy Light Quilt 25
25 °F, maker's own
1 lb 6 oz · ~$289 · Quilt
Zenbivy solved the quilt draft problem differently from everyone else: instead of strapping the quilt to the pad, the quilt clips to a fitted sheet that is already on the pad, so the seal moves with you and there is a hood-like head end built into the sheet. It is the most bed-like sleep system in this catalogue. Zenbivy publishes a limit-and-comfort pair of its own — 25 °F and 35 °F for this model — but does not claim ISO testing, so treat those as the maker's figures rather than lab ones.
- 7
Mountain Hardwear
Mountain Hardwear Bishop Pass 15
26 °F lab rating
2 lb 5.4 oz · ~$335 · Backpacking bag
A lot of down for the money: the Bishop Pass carries more fill than almost any bag at its price, at 650 fill power, and publishes an ISO comfort rating of 26 °F. Five and a half inches of measured loft in a 20-denier shell, with an expanded shoulder, hip and leg cut that Mountain Hardwear calls Performance Plus and most people would just call comfortable. At 37.4 ounces it is heavy for a 15-degree bag, and all of that weight is the low fill power buying loft through bulk.
- 8
Kelty
Kelty Cosmic Down 20
31 °F lab rating
2 lb 7 oz · ~$190 · Camping bag
The bag most people's first down bag is, and reasonably so: 550-fill DriDown, an ISO comfort figure of 31 °F, a semi-rectangular cut with room to move, and $190. Five-fifty fill is low, which means the warmth comes from bulk rather than quality — 16.4 ounces of down in a 39-ounce bag that packs big. As an entry into down camping it is hard to argue with; as a backpacking bag it is beaten on every axis by bags costing twice as much, which is exactly what you would expect.
- 9
Therm-a-Rest
Therm-a-Rest Corus 20 Quilt
32 °F lab rating
1 lb 10 oz · ~$310 · Quilt
The Vesper's argument made in cheaper materials: same shape, same straps, same EN comfort rating of 32 °F, but 650-fill duck down inside a 20-denier shell instead of 900-fill goose down inside a 10. That costs seven ounces and saves $150, which for most weekend backpackers is the right side of the trade. The thicker shell is also more forgiving of the way quilts actually get used — dragged half-off the pad, sat on at breakfast, stuffed wet.
- 10
Therm-a-Rest
Therm-a-Rest Boost 650 20
32 °F lab rating
2 lb 11 oz · ~$340 · Backpacking bag
Six sizes, three lengths in two widths, which is more fit choice than almost any other bag here offers and the reason the Boost is worth a look for anyone who has been cold in a standard mummy because they couldn't fill it — or trapped in one because they overfilled it. The Wide versions add eleven or twelve inches of shoulder girth, which is a genuinely different bag rather than a token option. The tradeoff is 650-fill down and 43 ounces in the Regular: heavy for backpacking, entirely reasonable for a bag that gets used a dozen nights a year.
The top three, in full
NEMO
NEMO Disco 15
The Spoon shape is NEMO's one genuinely original idea in sleeping bags: extra room cut in at the elbows and knees and taken back out at the shins, so a side sleeper can bend a leg without fighting the bag. If you have ever woken up wrapped in a mummy bag that rotated with you, this is the fix. The Disco is the 650-fill version — heavier and bulkier than the 800-fill Riff above it, and $100 cheaper. NEMO publishes an ISO lower limit of 16 °F but no comfort figure, which is the standard half-disclosure across this brand's line; assume comfort lands roughly ten degrees warmer.
Best for: Side sleepers who find mummy bags claustrophobic
Full spec sheet
NEMO
NEMO Forte 20
The synthetic Spoon bag, and the right recommendation for anyone camping somewhere persistently damp — the Pacific Northwest, the Appalachians in spring, anywhere a down bag spends a week slowly losing loft. Zerofiber is made entirely from post-consumer recycled polyester, and it keeps insulating wet, which down does not. The cost is real: 53 ounces and 10.6 litres of pack space, roughly a quarter more weight and 60% more volume than the down Disco at a similar rating.
Best for: Wet-climate camping where down is the wrong insulation
Full spec sheet
Enlightened Equipment
Enlightened Equipment Revelation 20
The quilt that made quilts mainstream in America. Enlightened Equipment builds every Revelation to order in Minnesota across five lengths, four widths, six temperature ratings, two fill powers and three shell deniers, which is thousands of combinations and the reason this entry lists one representative build rather than a size run. The Revelation's distinguishing feature against the otherwise-identical Enigma is a zippered and drawcord footbox that opens completely flat, so the same quilt covers a 20-degree night and a 60-degree one.
Best for: Buyers who want a quilt built to their own measurements
Full spec sheet