Criterion Down sleeping Bags Ultralight Series


Amazing pack size, weight and warmth at a lower cost than the premium Quantum range.


Cumulus Ultralight Sleeping Bags

The Ultralight range of sleeping bags by Cumulus offer amazing pack size, weight and warmth at a lower cost than the premium Quantum range.  A little bit heavier and slightly higher comfort temperatures than the Quantums but still boast top class warmth to weight ratios.

Ultralight 200 – A great summer bag with a comfort temperature of +3 degrees celcius, a weight of only 620g and a tiny pack size of 11x11x25cm uncompressed.

Ultralight 350 – A comfort temperature of -3 makes this a great spring to autumn bag, weighing only 765g and packing down to 12x12x27cm you will hardly know you are carrying it.

Temperature Rating :
Many influences can affect temperature ratings of sleeping bags using a similar level of down fill weight and fill power such as construction/baffle types, size/dimensions of the shell, fabrics, amount of down used in the hood, foot and zip & neck baffle sections. But also the differential fill i.e. relative proportions of fill of down used in the top and bottom sections of bag can have a significant bearing on the thermal efficiency. The temperature rating on the Criterion sleeping bags is a figure at which an average, experienced camper using a tent and good quality mat would feel comfortable at.
The rating is based on many years manufacturing experience, field trials and supported by independent tests at Leeds University. Although as you are aware many varying factors can affect comfort levels whilst sleeping not least the perception of comfort and warmth of the user.


  • Differential fill and differential cut
  • Box foot – comfortable, trapezium shape, for all feet positions
  • Cowl hood with elasticated, one hand operated drawcord
  • Full length, two-way YKK zip plus velcro fastener
  • Left and right handed zip models available, which can be zipped together if required
  • Anti-snag, full length zip baffle, down-filled to prevent cold spots
  • Inside pocket and hanging loops
  • Supplied with compact, fully-featured stuff sack and breathable, mesh storage bag

Technical Data

model construction


down quality
type, and fill power (1)
down weight Fill Volume (2) Total weight overall length max. person height width shoulders/
colours : outer/
“comfort” temperature rating stuff sack size
gms cu in gms cm cm
cm °C cm
grey goose
220 >4533 620 217 185


/electric blue
+3 11 x 11 x 25cm

14 gms

grey goose
350 >7933 765 217 185


75/50 black
-3 12 x 12 x 27cm

14 gms



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