+4°C

Big Agnes V Notch UL 40 Synthetic Sleeping Bag

4°C Comfort Limit, 340g of PrimaLoft Hi-Loft Ultra Silver Synthetic Insulation
Weighs 570g (Regular bag)
Code: SS19353V
  • From £174.99
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Big Agnes's V Notch synthetic sleeping bag has everything you need, a 3/4 length zip, hood and shaped footbox. The star of the show though is the Primaloft Hi Loft Silver Ultra insulation which delivers a low weight bag with a great summer temperature rating of 4C.

Big Agnes says:

You've got ultralight adventuring down to a science, right? Your pack and 90% of its contents is totally dialed in for fast and light on-trail travel in warm temps, but one thing is weighing you down. Even in those warm summer months, as soon as you get up high or down low near water, that chilly quilt or bulky old bag you've been using since high school is not cutting it. The V Notch UL is a highly compressible sleeping bag with a cozy lining of 80% recycled PrimaLoft® Hi-Loft Ultra Silver insulation. It will keep you warm and keep your pack light, whether that's a backpack, bikepack or packraft.

Big Agnes don't get their sleeping bags EN tested but they do quote a temperature rating that should be about equivalent to the EN 'Comfort Limit'. We can test that and infer the reasonableness of the 4C Temperature rating on the V Notch bag. 

The quoted temperature is 4C, which is the same as the temperature quoted for their superlight down bag, the Pluton UL. Now, the Pluton has 227grams of 850 Fill Power down providing the insulation - by comparing that to other down bags with similar levels of similar quality down their ratings compare well.

Taking a leap of faith then - this suggests that Big Agnes's ratings are reasonable and therefore the 4C rating is probably realistic - subject to the usual caveats about how individuals sleep and the conditions.

On to the bag itself - its heavier than its down equivalent but that isn't a surprise, its about 170grams different, but there's usually a reason why someone chooses synthetic over down, an allergy perhaps, performance when wet or simply durability (synthetic products tend to put up with more short term stress but in the long term down lasts even longer than synthetics, which lose their effectiveness eventually). Weight-wise it compares well with other synthetics and is at the higher performance end.

As a fast and light synthetic option Big Agnes' V Notch UL ticks all the boxes, 3/4 length zip, cinchable hood and shaped footbox. The hood is quite simple, which is what you would expect on a summer weight bag.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a sleeping bag advice
 EN 13537 rating for sleeping bags explained
 Sleeping bag shape and sizes advice
 Sleeping Bag features Page 1
 Sleepin bag features page 2
  • Crazylight minimalist mummy bag for your fast and light adventures
  • Highly compressible with water resistant PrimaLoft® Hi-Loft Ultra Silver
  • PrimaLoft® Hi-Loft Ultra Silver insulation with stitch-free construction for maximum thermal efficiency and water resistance
  • Minimalist hood with drawcord
  • Low-profile cordlock lets you un-cinch the hood with one hand
  • Full-length zipper can be opened up for quilt use and provides easy temperature regulation
  • 70" / 178cm YKK #3 locking zipper
  • Ergonomic footbox construction provides more loft and warmth
  • Two-way zipper
  • Zipper Garage
  • Interior fabric loops for sleeping bag liners
  • Streamlined exterior loops for hang drying or storage
  • Mesh storage sack & nylon ripstop stuff sack
 RegularLong
Weight570g652g
FillPrimaLoft® Hi-Loft Ultra SilverPrimaLoft® Hi-Loft Ultra Silver
Fill weight340g / 12oz397g / 14oz
Stuff sack size15 x 33cm15 x 33cm
Compressed bag size15 x 17cm17 x 17cm
Length183cm198cm
Shoulder Girth
150cm158cm
Hip Girth
135cm142cm
Foot Girth
91cm99cm
Comfort Limit
4°C4°C
Pad Size Needed
Any pad size or styleAny pad size or style

Materials & Construction

  • Nylon ripstop shell fabric with a water-repellent finish
  • Nylon ripstop lining fabric with a water-repellent finish
  • PrimaLoft® Hi-Loft Ultra Silver, 80% Recycled
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