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Katabatic Gear Alsek 22°F Quilt vs Therm-a-Rest Vesper 32F Ultralite Quilt

The Katabatic Gear Alsek is the better quilt for cold sleepers and shoulder-season trips. It is rated 22°F, weighs 23.6 oz with 850-fill down, and owners report it stays warm on frosty nights and holds loft for years. The Therm-a-Rest Vesper is lighter and uses higher-fill 900 down, but its narrow cut and 32°F comfort limit suit milder nights, and some owners report down migrating between baffles after a few years.

  • Choose the Katabatic Gear Alsek if you sleep cold, camp in shoulder seasons, or want a wide quilt with a pad attachment system that resists drafts.
  • Choose the Therm-a-Rest Vesper if you want the lightest possible pack for warm three-season trips and prefer a trim, mummy-free cut.

Prices

  • Katabatic Gear Alsek 22°F Quilt: $399.00 at Katabatic Gear (last seen Nov 9)
  • Therm-a-Rest Vesper 32F Ultralite Quilt: $399.95 at Adovvy Demo Store (last seen Nov 9)
  • Difference: the Katabatic Gear Alsek 22°F Quilt is $0.95 cheaper than the Therm-a-Rest Vesper 32F Ultralite Quilt at the latest prices (Nov 9)
Katabatic Gear
Katabatic Gear Alsek 22°F Quilt

Katabatic Gear Alsek 22°F Quilt

$399.00at Katabatic GearChecked Nov 9
See all prices and details
Visit Katabatic Gear
Pros
  • Warmer than its rating suggests, per owners
  • Wide cut and adjustable girth suit cold sleepers
  • Pad attachment system holds the quilt in place
  • Continuous baffles let you shift down where you need it
  • Holds loft over many seasons
Cons
  • Heavier than the Vesper
  • Uses 850-fill duck down, not 900-fill
  • Quilt shape leaves your back to the pad
Therm-a-Rest
Therm-a-Rest Vesper 32F/0C Ultralite Down Backpacking Quilt

Therm-a-Rest Vesper 32F Ultralite Quilt

Therm-a-Rest Vesper 32F/0C Ultralite Down Backpacking Quilt

4.5(36 ratings)
$399.95at Adovvy Demo StoreChecked Nov 9
See all prices and details
Visit Adovvy Demo Store
Pros
  • Very light and packs down small
  • 900-fill hydrophobic down dries fast
  • Box baffles limit cold spots
  • Not claustrophobic like a mummy bag
  • Works as a summer bag or an extra layer
Cons
  • Narrow cut feels tight for broad sleepers
  • Some owners report down migration and loss
  • SynergyLink straps fit poorly on 25-inch pads
  • Neck closure tab can feel weak

What separates them

Katabatic Gear Alsek 22°F QuiltTherm-a-Rest Vesper 32F Ultralite Quilt
Temperature rating22°F20°F label, but owners say it is warm to about 32°F
Fill power850-fill duck down900-fill hydrophobic down
Weight23.6 ozAbout 19.4 oz
Cut and widthWide, adjustable girthNarrow, tight fit
Pad attachmentPatented system with elastic binding at the bottom openingRemovable SynergyLink straps, weak on 25-inch pads
Draft protectionDown-filled collar plus continuous bafflesSnap neck closure and perimeter side baffles
Durability reportsOwners report full loft after 10 yearsSome owners report down migration and loss after about 4 years
Packed sizeCompact for its ratingVery small pack size

Price history

$399.95$399.00
Nov 9Nov 11
  • Katabatic Gear Alsek 22°F Quilt: lowest $399.00 on Nov 9 at Katabatic Gear.
  • Therm-a-Rest Vesper 32F Ultralite Quilt: lowest $399.95 on Nov 9 at Backcountry; $399.95 on Nov 11.

Prices at every store

Katabatic Gear Alsek 22°F Quilt

  • Katabatic GearNew

    In stock

    $399.00Free shippingChecked Nov 9
    Visit Katabatic Gear
Prices and history →

Therm-a-Rest Vesper 32F Ultralite Quilt

  • BackcountryNew

    In stock

    $399.95Free shippingChecked 15 h ago
    Visit Backcountry
  • REINew

    In stock

    $399.95Free shippingChecked 15 h ago
    Visit REI
  • Cascade DesignsNew

    In stock

    $399.95Free shippingChecked 15 h ago
    Visit Cascade Designs
  • Adovvy Demo StoreNew

    In stockReturn policy

    $399.95Checked Nov 9
    Visit Adovvy Demo Store

Also available at

  • Cascade DesignsCheck price at Cascade Designs

Store links may earn us a commission. Some prices via Klarna.

All 8 stores and price history →

Specs compared

SpecKatabatic Gear Alsek 22°F QuiltTherm-a-Rest Vesper 32F Ultralite Quilt
ColorCastlerock Grey, Lyons BlueVapor
Temperature Rating22°F20F
Size6'Long, Regular
Count11
Item Weight23.6 oz0.55 kg
Fill TypeDown, Duck DownDown
Fill Power850fp900
Material TypeSilnylon (Stuff Sack), Eco-friendly fabric with…10D Nylon RipStop (lining fabric)
Material CertificationsResponsible Down Standard (insulation), Bluesig…Responsible Down Standard Certified, RDS
Age GroupADULTAdult
OccasionWarmer months, Shoulder seasonsCamp
Typical UsersHikers, Backpackers, Cold sleeperThose that carry nothing but the essentials
Show all 21 specsShow fewer specs
SpecKatabatic Gear Alsek 22°F QuiltTherm-a-Rest Vesper 32F Ultralite Quilt
Fit StyleAdjustable girth (quilt style bags)Tight fit, Fairly narrow cut
ShapeQuiltQuilt
Length6'191 cm
WidthWide147 cm
Pattern TypeSolid—
OrganicEco-friendly fabric with Hemp & Tencel blend—
ThemeSolid—
Closure Type—Snap neck closure
Design Highlights—Perimeter side baffles, Insulated footbox

What reviewers say

Katabatic Gear Alsek 22°F Quilt

Owners consistently say the Alsek sleeps warmer than its 22°F rating implies and packs down small. They praise the pad attachment system and durability, with some reporting full loft after a decade.

What people mention
  • WarmthPraisedOwners say it keeps cold sleepers warm on frosty nights and outperforms its rating.
  • PackabilityPraisedIt compresses small and adds little weight to a pack.
  • Pad attachmentPraisedThe patented strap system is adjustable and holds the quilt in place without drafts.
  • DurabilityPraisedLong-term owners report it still looks new with full loft after years of use.

Therm-a-Rest Vesper 32F Ultralite Quilt

  • 4.5 / 536 ratings

Owners rate it highly for warmth-to-weight, small packed size and freedom of movement compared with mummy bags. Complaints center on long-term durability: down migrating between chambers and leaking, plus straps that don't seal the sides well.

What people mention
  • WarmthPraisedOwners say it is very warm for its weight and comfortable down to about 32F.
  • Pack sizePraisedReviewers note it compresses to a very small packed size.
  • Down migrationCriticised

Questions and answers

Which is warmer for cold sleepers?
The Katabatic Alsek. Its 22°F rating, down collar and continuous baffles keep cold sleepers warm on frosty nights, and owners say it outperforms its rating. The Vesper is comfortable to about 32°F.
Which quilt is lighter?
The Therm-a-Rest Vesper, at about 19.4 oz against 23.6 oz for the Alsek. The gap comes from the Vesper's 900-fill down and narrower cut.
Which lasts longer?
The Alsek has the better record. Owners report full loft after 10 years, while some Vesper owners report down migrating between baffles and down loss after about four years.
Will the Vesper fit a wide sleeping pad?
Not well. Its SynergyLink straps are reported to work poorly on 25-inch pads, and the narrow cut leaves less coverage. The Alsek's attachment system and wide cut handle wide pads better.
Is the Alsek worth stepping up to over the Vesper?
Yes for shoulder seasons and cold sleepers. You give up some weight and fill power but gain warmth, width and a stronger durability record. For mild summer trips, the Vesper's lighter pack is the better fit.

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Buying guides that pick them

  • Best backpacking down quilts for ultralight camping
One long-term owner found about 8 baffled chambers empty of down after roughly 4 years.
  • Down leakageCriticisedBuyers report the quilt bled down without any visible holes.