GEAR CATALOG / SLEEPING BAGS / SPARK 45F DOWN SLEEPING BAG
ITEM № 0116 · SLEEPING BAGS
PHOTO 01 / 01 · 363 G
IN STOCK · SHIPS DAILY
Spark 45F Down Sleeping Bag
front
SIDE
PROFILE
DETAIL
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FIELD MEASUREMENT · OUR SCALE
Mfr says 0.8 lb. Ours weighed in at 0.84 lb on a calibrated scale · close enough to forgive.
Sea to Summit
CATALOG · 0116

Spark 45F Down Sleeping Bag.

Count on a great night's sleep while counting grams with the Sea to Summit Spark 45F sleeping bag

PRICE
$349
WEIGHT
363 G
0.8 LB · 12.8 OZ
RATING
★ 4.2
60 reviews
↖ ounce-for-dollar, hard to beat
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Spark 45F Down Sleeping Bag is not in comparison
PACKED ALONGSIDE
SWALLOW UL 20/30 SLEEPING BAG NANOWAVE 45 SLEEPING BAG - MEN'S SNOWLINE SLEEPING BAG MERINO WOOL LIGHTWEIGHT HIKING CREW SOCKS
Field notes Specs Reviews · 60 Dissent · 8 UPDATED 15 FEB 2026
FIELD JOURNAL · ENTRY №0116

Count on a great night's sleep while counting grams with the Sea to Summit Spark 45F sleeping bag. It's warmed with 850+ fill-power down, and the 10-denier shell sheds wind and condensation.

"Light enough to forget, structured enough to remember — that's the bar every piece of gear should hit."
— DESERT RAT DAN · PCT NOBO 2024
THE GOOD
  • + field-tested by long-trail hikers
  • + honest weight on a calibrated scale
  • + peer reviews · no affiliate slop
  • + Sea to Summit reputation in this category
THE CATCH
  • − premium price
  • − single-use design — read the fine print
  • − availability runs short in shoulder season
  • − see dissent thread below for edge cases
From the trail

Reviews · 60

4.2/5
★ ★ ★ ★ ★
＋ Write a review
S
@desertratdan PCT NOBO · 2,653 MI VERIFIED PURCHASE 14 SEP 2024
★ ★ ★ ★ ★
Carried this from Campo to Manning. Held up better than I expected and survived three resupply box compressions. The fit and finish is the unsung hero — actually does what the spec sheet says.
F
@frostbite_fi TMB CCW · 105 MI VERIFIED PURCHASE 02 AUG 2024
★ ★ ★ ★ ★
Loved it for shorter trips — but I'd size carefully. The reference fit ran a hair small for my torso and I had to swap mid-trail. Once I had the right fit, no complaints.
B
@bivy_boy CT NOBO · 486 MI DISSENT 11 JUL 2024
★ ★ ★ ★ ★
Bottom panel pilled to fuzz by mile 200. Marketing copy isn't bombproof — pretend it's a delicate piece in disguise and it lasts. Drag it across granite and it doesn't.
↳ 14 hikers found this useful
SEE ALL 60 REVIEWS →
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