Sea to Summit Spark Down 45 F Sleeping Bag

About This Item

Temp Rating

35 Degrees or Higher

Insulation Type

Down

Design:

  • Uses a full-box baffle construction to accommodate extra down and reduce cold spots
  • Expedition mummy bag sizing provides extra space for layered clothing or extra wiggle room
  • Vertical baffles in the chest optimize the position of down to prevent it from moving during use
  • Full side zipper with 2 sliders provides easy access and extra ventilation options
  • Zipper draft tube, hood, and front neck draft collar all prevent warmth being lost when needed most
  • Ultra-light 7D and 10D fabrics for minimal weight and packed size
  • Contoured mummy shape for comfort and efficient insulation

Technology:

  • RDS 850+ Loft Premium Goos ULTRA-DRY Down™ for maximum insulation valve

Additional Details:

  • Recommended Max User Height: 6’
  • Brand : Sea to Summit
  • Country of Origin : Imported
  • Web ID: 23S2SASPRKDWN45FSCSLA
ShapeMummy
Temp Rating45 Degree (F) / 7 Degree (C)
Comfort Temp*51 Degree (F) - ISO
Limit Temp*45 Degree (F) - ISO
WeightRegular: 12.8 ounces; Long: 13.7 ounces
Insulation TypeDown
Fill Power850-Fill-power goose down
Fill WeightRegular: 5.3 ounces; Long: 6.1 ounces
Shoulder GirthRegular: 61" ; Long: 65"
Hip GirthRegular: 61" ; Long: 65"
Compressed VolumeRegular: 2.4 liters ; Long: 2.9 liters
Shell Fabric10-Denier nylon
Zipper LocationLeft
Stuff Sack IncludedYes
Stuff Sack VolumeRegular: 2 liters ; Long: 3 liters

REVIEWS

4.8

95 Reviews

Excellent Bag And Service

I work wildland fire and hunt in the off season. Not to toot my own horn but i get a good sleeping bag when I have one. Comfort and weight are on point. great toe box. I was showing my buddy how light the bag was and he dropped it on a buddy heater. Sea to Summit took care of the whole fix. Absolutely amazing. Simple bag that works as one would want.

The Spark Performs

I just completed a 750 mile section of the Florida Trail in 10 weeks. I slept in the 30 degree Spark every night. Throughout the 10 weeks there were many nights below freezing with temperatures dipping to the mid 20s. The spark performed marvelously! I even slept without a pad and still was comfortable. I wore multiple layers to sleep only once and frequently used my Poncho as a vapor barrier to help insulate. Other hikers complained about being cold when I was cozy and warm. The only complaint I have about this bag is that with the short zipper it can be a struggle to get in and out of sometimes. But I will take the weight savings that come with that feature over a little wiggling. The dampness of Florida nights did not cause the bag to become wet and my fears of carrying a down bag in a humid environment were conquered. A wonderful product all around.

Received incentive

In Progress

I got this as a dual purpose bag. First, an ultra light / ultra compact summer bag. Second, to pair with a 25 degree quilt for winter camping. Tried it once in a fire lookout and was too warm (ditched the quilt). Going to put it through its paces over the next year!

Received incentive

Finally A Cold-weather Bag That Fits A Big Guy (And A Side Sleeper)

I’m 6'4", about 240 lbs—built more like an aging NFL linebacker than a thru-hiker—and this bag actually fits. Plenty of room to move without cold spots, which matters if you’re a side sleeper like me. It’s warm, comfortable, and feels thoughtfully designed rather than scaled up as an afterthought. Build quality is excellent across the board, and both the storage bag and compression sack are noticeably higher quality than what usually gets tossed in. If you’re bigger, move around in your sleep, and still want real 0-degree performance, this bag delivers.

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Best Sleeping Bag.

I tried this sleeping bag all the way down to 5°F with layered clothing, and it did fantastic. Super comfortable. I highly recommend.

Received incentive

Excellent Quality, Warm And Comfortable1

I've used the Sea to Summit Spark 30 on a few trial runs and am impressed with the quality of the bag, compression sack and storage bag! The sleeping bag has been warm and comfortable and packs well. I'm an avid hiker/thru hiker and this bag is a great addition to my gear closet!!!

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Great Bag, Too Small .

Great bag, too small . Insulation fantastic and so light!

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Perfect Bag!

Packs down super well, love that I can unzip the bottom and walk around LOL. Big fan!

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Fabulous Sleeping Bag

Love this sleeping bag. I’m particularly impressed with how small it packs down to and how little it weighs, which is important for me as a bike packer.

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Double Spark

Really a very nice double sleeping bag. Enables a warm sleeper(me) to keep cold sleeper (wife) warm, happy campers! The straps for keeping pads together are a fail. Had to order SToS straps instead.

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Scary Light

I get cold very easy, even in warmer temps. I was so nervous to try out this bag, because it feels super lightweight and airy. I thought it couldn’t possibly be warm enough. I got the chance to test it out recently, and even brought an extra bag just in case I needed to double up. No sir! I slept snug as a bug the entire trip. Not only is it cozy and lightweight, it also packs down small. Perfect for fitting in a suitcase, backpacking, or even alpine.

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Great 👍🏾

Slept great on the air pad and tucked nicely in the spark. Temps down to 30 degrees and woke up with frost on the ground. The 15 degree sleeping bag did great.

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Warm And Compact

Love this bag, I should have spent the money years ago on a bag of this quality instead of trying to save money on a 650 FP bag. It's light, compresses well, and has been super comfortable to sleep in.

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Spark Down Sleeping Bag

This is a great little bag that I actually use for all sorts of warm weather things, including when I’m traveling in a hotel room and I don’t like the sheets! It also packs into something the size of a Nalgene bottle, which is incredible to me. Great product.

Received incentive

Super Warm And Light

This thing is so cozy and I loved the footroom and fabric that repels moist

Read All Reviews (95)