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A big bag for big dudes.

The folks at Big Agnes were looking out for all you Paul Bunyan types when they created the Summit Park 15-Degree Down Sleeping Bag. The Summit Park combines oversized dimensions with a semi-rectangular mummy shape to give you more room in the shoulders and footbox.

  • Rated down to 15F, this bag is best suited for cold, sheltered nights in the mountains and winter nights in milder climates
  • Big Agnes sleeping bags leave out the bottom insulation, both to save weight and because down compressed by your body weight loses most of its insulating value
  • Note: bag requires a 25-inch-wide rectangular sleeping pad to be fully insulated (sleeping pad available separately)
  • Tough nylon ripstop outer shell provides durable protection
  • The 600-fill down compresses and rebounds well and features a high warmth-to-weight ratio
  • Insotect Flow construction eliminates potential cold spots, and its vertical baffles allow for a more uniform body heat distribution
  • Built-in pillow pocket keeps your pillow in place
  • Interior fabric loops to keep your liner in place

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Here's what others have to say...

Unanswered Question

I have the Big Agnes Encampment synthetic 15 Degree sleeping bag. I have used it three times in mid 30 degree F temperatures with the insulated qcore pad. All three times I have been too cold to sleep. I am looking at the 15 degree down fill version because I really like the bag design, does anyone know if the down fill will be warmer than the synthetic?

What pad sizes work with this sleeping bag?

Best Answer

Pad sizes that work with each sleeping bag size:

Regular (Sleeping Bag): 25"x72" or 64cm x 183cm

Long (Sleeping Bag): 25"x78" or 64cm x 198cm

Anytime you have a Big Agnes question, shoot me an email and I'll make sure to work with you 1-on-1!

Jared D.

Expert Gearhead



Awesome sleeping bag

  • Familiarity:I've used it once or twice and have initial impressions

I just spent a week in upper Wisconsin camping. I am a side sleeper and I ripped the zipper in my old bag in early March. During my research, I came to the conclusion that this would be a good bag for side sleepers. I was not disappointed. I am also a very cold sleeper. The temperature was in the low 40s at night. The bag is rated for 15 degrees and I was at the perfect sleeping temperature (for me) in just shorts. I could see myself being comfortable at lower temps while wearing more clothes, but I think I'd use my fleece liner in the low 20s and below.

I paired this bag with the Big Agnes Insulated Q-Core Sleeping Pad (wide, long). This bag REQUIRES A SLEEPING PAD as there is no insulation on the bottom of the bag to save weight. I can honestly say that I had a better sleep using this system than I get on my bed at home.

I will be camping at least once a month for the rest of the year and I am looking forward to how this bag will perform in the colder months.

Will the Exped Downmat 7 that is 26" wide...

Will the Exped Downmat 7 that is 26" wide fit in this bag?

Best Answer


The Downmat 7 is a pretty thick pad, besides being 1" wider than what the bag's sleeve is designed to take. You might make it fit, but even if it will slip in, it's going to always be a little cupped because it's not going to be able to lie down perfectly flat. For the BA bags, it might be best to use one of their compatible pads. Hope this helps.

It will fit just fine. I have used Exped 9DLX pads in Big Agnes park bags for years without a problem. In fact that extra inch in width will seal the big agnes bag better than their own 25" pads, which when measured are actually only 24" wide. Just be sure to get a pad with at least the same temp rating as the bag itself if not more so.

What is the best pillow to use for this...

What is the best pillow to use for this bag that is comfortable and big.

Two unrelated items. A pillow that's comfortable and big will work with any sleeping bag. Take a look at the WM Cloudrest ( and the large Thermarest Down PIllow (