Sea to Summit Spark SPII Sleeping Bag: Relax in Luxury with the Best Sleeping Bag

The sleeping bag is one of the most essential parts of camping equipment and it definitely makes a difference when you are enjoying nature at night. The Sea to Summit Spark SPII Sleeping Bag is one of the more lucrative bags on the market and it has been designed to provide you with all the comfort and quality that you will need in the wilderness.

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Product Specifications

  • Lightweight, durable
  • Great warmth and comfort
  • Shell: 10D UL Nylon treated with DWR
  • Liner: 15D nylon soft touch, high density weave
  • Great insulation – 850+ loft Ultra-Dry Down (90/10 European goose down)
  • 1/3 length #3 YKK zipper
  • Sew-through transverse baffle construction
  • Includes Sil-nylon compression sack – compressed it’s smaller than football

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Whether you’re an avid backpacker/camper or a first-timer, you want to be able to sleep in comfort no matter where you are. This sleeping bag isn’t just made for warmth and comfort but it’s also ideal for those that are worried about weight.

If you’re looking for a sleeping bag which won’t add bulk and extra pounds to your back, then you’ll love the feather-weight design of the Sea to Summit Spark. So, whether you’re backpacking during the spring, summer, fall or winter, this sleeping bag is built to support you throughout the year.

You no longer have to search for that perfect sleeping bag because it’s right here in front of you.

Sea to Summit Spark SPII Ultra-Dry Down Sleeping Bag

One of the main features that the Sea to Summit SPII Ultra-Dry down sleeping bag brings to the table is the fact that it only weighs one pound. This makes the bag great for backpackers and it can also easily be carried around for longer distances without having to cause much fatigue.

The sleeping bag is not quite the same as many of the other sleeping bags and it does feature some of the non-essential features that will make the bag more custom to you. 

The 2° temperature rating directly indicates to us that the sleeping bag falls in the winter bags category and since it is made from down insulation, the sleeping bag will ensure that you are kept warm in some of the coldest camping conditions aside from outside in the snow.

This bag is constructed from 10D nylon materials, which also adds to the overall durability of the bag and since it has been treated with a water resistant substance, the sleeping bag will keep you dry in the rain as well.

However, eventually, water will start seeping through the zipper areas after prolonged exposure and this is the one fatal flaw in this bag.

The down materials are great for insulation, but once they do get wet, they will stay wet for longer and become soggy, thus rendering the sleeping bag useless for the time being. We recommend that you try and keep the bag as far away from water as possible to ensure that you can have a dry sleeping experience.

Now that you understand some of the basic features of this sleeping bag, let’s have a look at some of the essential features and how they could possibly benefit you.


Since the sleeping bag only weighs in at approximately one pound, the bag will definitely be easy to carry along. The manufacturers kept in mind that minimalists always love to carry along as little products as possible and they also like to save a lot of space. This sleeping bag comes with a sil-nylon compression sack which is extremely small.

So, while rolling up your sleeping bag, you’ll want to pack it as tightly as possible. After it’s completely packed, it’s smaller than a football, so you can fit it in your backpack with no problems.

With this bag, you will be able to venture without feeling like you’re carrying your home on your back.

Design and durability

The design of the Spark sleeping bag is very simplistic and minimalist, which is what you should be looking for if you’re concerned about weight. It’s designed to be a slim fit, with lightweight fabric and 850+ fill down.

There’s a contoured hood with a drawcord, a large zipper with a no-snag fabric that’ll prevent you from having any zipper issues. A nice feature is that it’s anti-microbial and anti-bacterial. 

Because weight was the main focus of the Spark, there aren’t any special features which add to the design. It’s supposed to be lightweight and warm – that’s it.

In terms of durability, the 15-denier Nylon lining give the sleeping bag its durability without having to sacrifice its lightweight feature. So, it’s a perfect blend of both strength, warmth and minimalist design.


The bag features down insulation incorporated in the construction and since it is really lightweight, people might be skeptical about the warmth that it provides.

The European duck down has been widely known for the great insulation that it offers the user to ensure that they stay warm. The bag has a cloud-like feel on the inside and this should really help to promote comfort as well.

The sleeping bag can also fully zip up and the added hood will not only provide great comfort for your head but also some excellent heat retention. If you have a beanie to add to your sleeping attire, the bag will keep you warm in even colder conditions.


The primary high loft downs used in the construction of the bag will make this bag extremely comfortable. It also features a slim design, which means that you might be giving up a little in terms of spaciousness in the bag, but you will gain a lot from having better insulation.

This bag is also extremely durable on the outside and it has been made from 10 denier nylon materials. The materials will also add a little extra padding to the bag from the ground and you should not have a lot of problems mirroring the good night’s rest that you are used to at home.


Of course, because it’s a lightweight sleeping bag there will be some features that will be taken away. Because it’s lightweight, the Spark SPII isn’t as versatile as it’s competitors. The minimalist design prevents the sleeping bag from being able to endure extreme weather conditions.

So, if you’re planning on using it during snow storms and windy conditions, do not expect it to withstand those conditions.

In that case, you’ll need a sleeping bag that’s designed for harsh weather conditions which most likely means it’ll be heavier. So, if weight is really an issue for you, know that you’ll have to sacrifice some feature.

However, if you’ll be camping or backpacking outside the shoulder seasons, then this sleeping bag will provide you just the right amount of warmth and comfort.

Value for Money & Guarantee

If you’re backpacking on a budget, this may be a little out of your price range. However, for the quality of the sleeping bag and the lightweight features, it’s well worth the investment. This sleeping bag will be by your side for years to come.

Any Sea to Summit product, including the Spark SP II is provided a warranty against defects in materials and workmanship for the intended life of the product.  So, you’re given your basic limited warranty which most companies offer to their clients.

Overall, for the quality of the product, the Sea to Summit Spark SP II is reasonable in price. You won’t be able to find another durable lightweight sleeping bag for anything less expensive.

Unique features

The unique feature about the Spark SPII is the weight. In all other factors, the sleeping bag’s feature has been cut dramatically in order to give users the lightweight design.  Its lack of features is its biggest feature.

Close Competitors

Sea to Summit Spark SP III Sleeping Bag

The Sea to Summit Spark SP III is the warmest sleeping bag out of the Spark series, so if you need a warm bag, then opt for this one.  On the market, this is the best warmth-for-weight sleeping bag you can find.

You’ll be able to take this sleeping bag with you through any season and it’ll hold up against both the heat and cold weather up to -4 degrees Celsius.

The Spark SP III is an ultralight sleeping bag with 850+ goose down with an UltraDry glaze, preventing the absorption of moisture which adds extra weight to your sleeping bag. If you’re going on a cycling tour, hiking trip or adventure race, you’ll want a sleeping bag that’ll support you through it all.

Now, with year-round support, you’re going to be paying slightly higher for this sleeping bag in comparison to the other Spark bags. However, if you’re an avid outdoor enthusiast, you’re well aware of the importance of a high-quality sleeping bag.

Users generally don’t have any complaints with this sleeping bag. Users are very happy with the quality of the bag and the protection they’re provided against the elements. If you have a larger budget and will be needing a sleeping bag for year-round activities, then opt for the Spark III.

Sea to Summit Trek Tk II Sleeping Bag

The Sea to Summit Trek Tk II Sleeping Bag is a classical tapered rectangular shape which you’ll be able to use for 3-seasons. If your budget cannot accommodate the Spark SP II, this is exceptional alternative.

It’s a high-loft water-resistant down insulated sleeping bag that is known for its warmth and effective compressibility.

It does have slightly less fill power, 650 fill,  as opposed to the Spark II, 850+ fill. So, it won’t be able to take you through winter, however, from spring to fall, you’ll be kept warm. The UltraDry down is treated with a water-repellent polymer glaze which allows it to retain over 60% loft and absorbs 30% less moisture.

It’s highly durable and designed with a high-density weave, 33-denier fabric with a durable water-repellent glaze. Though it’s water repellent, the material is still highly breathable, so you won’t be overheating in your sleeping bag.

Its classic semi-rectangular design allows gives you an ample amount of space within the sleeping bag while retaining heat.

You do have a large security pocket inside your sleeping bag, so you’ll be able to store some of your valuables inside, giving yourself a piece of mind while you’re sleeping. In addition, it also comes with a compression sack and a mesh storage sack, so you’ll be able to carry it and store it safely.

Users of the Trek Tk II do confirm that this sleeping bag isn’t made for the winter season, so if you plan on camping/backpacking during that time, it’s best to invest in a sleeping bag with more weight.

Overall, if you don’t have the budget for the Spark SP II, the Trek Tk II is a great alternative for camping and backpacking.

Sea to Summit Traveler TR1 Sleeping Bag

The Sea to Summit Traveler TR1 Sleeping Bag is another sleeping bag from the Sea to Summit company which is a good option if you’re unable to purchase the Spark II. If you’re looking for a sleeping bag to take you through the spring and summer or a sleeping bag for year-round hosteling, this is the one.

It’s made with high-loft 750-fill duck down which gives you warmth while the UltraDry Down glaze retains 60% more loft and absorbs 30% less moisture than untreated down. This greatly effects the weight of your sleeping during the wetter days.

What’s great about the Traveler TR1 is that you can connect it to another Traveler TR1 if you’ll be sleeping with another person. If you decide to unzip the sleeping bag, you can use it as a blanket comfortably for two people. So, it provides you with versatility that many other sleeping bags do not.

The design is meant to give you a mummy-shaped sleeping bag which seals in the heat. The ripstop nylon shell will hold up against wear and tear and comes in either a gay or teal color. To store this sleeping bag, you’ll use the Ultra-Sil compression stuff sack and mesh storage bag to choose from. 

Users of this sleeping bag don’t have much to complain about, only that this sleeping bag won’t be able to help you through the winter. Also, if you’re a larger person, you may need two of these bags, but they can zip up together, so that problem is solved.


This sleeping bag should be perfect for the super minimalists and it has specifically been trimmed of excess weight to make space for a more comfortable, but lightweight design.

Campers might be able to look for something more insulated and heavier, but the Spark will be perfect for saving you extra weight while backpacking and hiking.

Furthermore, the durability of the bag is also exceptional and it should come as no surprise that the bag does command somewhat of an expensive price. But of course, we don’t want to make the decision for you, so here is a list of pros and cons when it comes to the Spark SP II.


  • Extremely lightweight, less than 1 lb.
  • Smart features
  • Minimalist design
  • High warmth retention
  • Water-repellent outer shell
  • Compresses into the size of a football
  • 850+ fill down
  • Year-round sleeping bag


  • Not ideal for extreme weather conditions
  • Not as versatile as its competitors

Now that you know about the Spark SP II and its features, you should look and see if its fits your needs.

We would like to thank you for reading this article and we hope that you are now able to understand how the Sea to Summit Spark SPII sleeping bag will be great to use on your next backpacking outing.

Sea to Summit Spark SPII Sleeping Bag
  • Packaging
  • Design and durability
  • Warmth
  • Comfort
  • Versatility
  • Value for Money & Guarantee


A sleeping bag with versatility and design in mind to keep you comfortable, no matter the weather. Whether you’re a touring cyclists, hiker, backpacker or avid hosteler, the Spark II is a great option is providing you a lightweight sleeping option. You don’t need to carry a 10 lb. sleeping bag in order to have a good night’s sleep.

User Review
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We would like you to let us know if you might have had any experiences with the bag and how those experiences have proved to be. If you tried out some of its competitors, feel free to also share your experiences with them as well.


4 thoughts on “Sea to Summit Spark SPII Sleeping Bag: Relax in Luxury with the Best Sleeping Bag”

  1. We have Sea to Summit Spark SPII Sleeping Bag and so far, it is really awesome. I think your rating is perfect. Just by looking at it, you will know right away that it is durable because of its materials. The warmth it gives is also great. I highly recommend it.

  2. I think Sea to Summit is one of the best brands in the market today. I have always been loyal to them not only because of their awesome quality products, but also great customer service. I always recommend them to my friends who love the outdoors. My favorite is their Sea to Summit Traveler TR1.


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