Sea to Summit Spark Down Sleeping Bag 45°F/7°C - Regular

Reviews

• fanny L.

  Rated 5 out of 5

  Perfect lightweight sleeping bag for bikepacking

  09/16/26

  Bought this sleeping bag for bikepacking and I’m really happy with it. It packs down super small and is very lightweight, which is exactly what I wanted. I was a bit hesitant about going with a mummy bag because I don’t like feeling too warm or restricted when I sleep, but this one is surprisingly breathable and comfortable. I used it on a 16°C night at the end of August in the Eastern Townships and slept really well. The compression sack that comes with it is also great, and the down feels like good quality. It definitely feels like something that will last for years. For reference, I’m 5’5”, 65 kg and the Small fits me perfectly — nice and snug without feeling too tight.

• Marc-Andr D.

  Rated 5 out of 5

  The ultimate bag

  06/04/26

  Light, comfortable and so easy to pack. This sleeping bag is perfect for summer adventures. I also plan to bring it during my backcountry ski days in the winter as it will be very useful in case of emergency.

• Julien D.

  Rated 5 out of 5

  Le choix pour le fastpacking

  01/17/26

  Je m'équipe tranquillement pour faire du fastpacking. Je cherchais un sleeping bag ultra compact et je suis agréablement surpris. Il ne prends pas beaucoup de place. Je n'ai bien évidemment pas eu l'occasion de le tester sur le terrain puisque nous sommes en plein hiver mais je l'ai essayé chez moi et il est assez confortable. Le matériel est également de qualité. Sea to Summit n'a évidemment plus besoin de faire ses preuves. J'ai hâte de le tester cet été.

• Cook K.

  Rated 5 out of 5

  Compact and light for bikepacking

  05/30/25

  Impressed with the compressed size, it saves lots of space for bikepacking.

• Mark M.

  Rated 5 out of 5

  Lightweight and well made

  03/13/25

  This is a well made sleeping bag. I purchased it for some bikepacking trips this summer. I haven’t tried it much yet but it seems to be well made and very light. I would say it’s best suited for warmer summer camping.

• Terry E.

  Rated 4 out of 5

  Only one flaw

  06/03/24

  So, I ordered this bag along with the thermarest hyperion 0. What I like about this bag is that it is more roomy in the upper body area than the thermarest. It also compacts down very small and is the lightest. The only issue If that the zip does not go down the whole way nor can you open up the feet section. So, I have a feeling that this bag is for the true weight weenies that are camping at a very specific temperature range. It’s a warm weather bag but if its too warm you are stuck and if it gets colder you are stuck as well. I then found the Traveller S2S and although it does not pack as small and is heavier than the spark for the same temp rating, I can see it being more useful for temperature regulation. I opted for that instead.