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Therm-a-Rest Vesper Sleeping Bag: 20F Down

$369.95 - $389.95

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Vesper 20 Degree Down Sleeping Bag

For through-hikers who want nothing but the essentials in their minimalist pack, the Therm-a-rest Vesper 20 Degree Down Sleeping Bag is their ticket to warmth and comfort in a lightweight, no-thrills package. Stuffed with an impressive 900-fill serving of down, this bag will keep you toasty on cold spring and autumn trips, and it features a classic box baffle construction to maximize loft and minimize cold spots. The insulation has been treated with NikWax, which helps the down stay dry and retain heat-trapping loft 60 times longer than untreated down.

This streamlined quilt bag features a zipperless design and insulation-free back, minimizing excess materials where they'd normally go to waste. Perimeter side baffles, a snap neck closure, and the insulated footbox all combine forces to eliminate chilly midnight drafts, while the bottom can be secured to your sleeping pad using the SynergyLink tabs. When you're ready to pack up in the morning, the Vesper takes up barely more room than your beloved single liter water bottle.

  • Minimalist sleeping bag for shoulder season backpacking trips
  • 900-fill down traps valuable body heat on chilly nights
  • Hydrophobic treatment ensures better warmth in wet weather
  • Top quilt lined to trap radiant body heat for extra comfort
  • Zipperless design minimizes excess material and weight
  • Connectors allow you to stabilize the bag on a sleeping pad
  • Item #CAS00ER

[shell] 10D nylon ripstop, DWR finish, [lining] 10D nylon ripstop, ThermaCapture
900-fill Nikwax Hydrophobic Down, RDS-certified
Max User Height
[regular] 6ft, [long] 6ft 6in
Shoulder Circumference
[regular] 58in, [long] 61in
Hip Circumference
[regular] 51in, [long] 54in
Foot Circumference
[regular] 37in, [long] 40in
Bag Length
[regular] 75in, [long] 79in
Draft Tube
Pad Retainer
SynergyLink Connectors (removable)
Fill Weight
[regular] 12oz, [long] 13oz
European Norm Comfort Rating
Storage Sack
Stuff Sack
Stuff Size
5.5 x 8in
Claimed Weight
[regular] 1lb 3oz, [long] 1lb 5oz
Recommended Use
Manufacturer Warranty

Tech Specs

California Proposition 65


This product can expose you to chemicals including Toluene, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

What do you think about this product?



So I have to say I miss being able to chat with a Gear Guide. =( Anyway, this feels really neat to me but struggling to understand if it is practical. It weighs 1lbs 5oz, it's presumably colder than a 20-degree bag. What's the advantage? It seems hard to set up since you have to tie it to the pad etc. Bathroom breaks easier? Takes up less room? Not seeing the weight savings. Does anyone have any thoughts? I was thinking of getting the two-person one for me and my wife for summer camping in California. But then again, not sure it provides the protection from bugs and snakes my wife insists on.