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Big Agnes Summit Park 15 Degree Long Sleeping Bag Item # BGA91211M

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Availability: In Stock!

Orders placed in the next 6:28 hours ship today!

Availability: In Stock!

Orders placed in the next 6:28 hours ship today!
The Big Agnes Summit Park 15 Degree Sleeping Bag works well for the extra-large backpacker who can't find a bag that fits or the car camper who wants extra room and the luxurious comfort of 650 goose down.


The Big Agnes Summit Park 15 Degree Sleeping Bag works well for the extra-large backpacker, with a chest size up to 56 inches, who can't find a bag that fits or the car camper who wants extra room and the luxurious comfort of 650 goose down.

Appreciated by bigger backpackers that need more room and are tired of using bulky, cumbersome car camping bags that weigh too much to carry in a pack, the Summit Park offers a solution to this dilemma. While it isn't going to pack down to the size of a Nerf ball, with compression straps the Summit Park can be squeezed down to an acceptable 9 in. x 10 in. and it weighs in at less than 4 lbs.

But, big backpackers aren't the only folks who will appreciate the Summit Park's features. The reason the Summit Park is so light and compressible is its 650 down fill. This luxuriously soft insulation combined with the generous semi-rectangular cut and the Big Agnes sleep-system make the Summit Park 15 Degree incredibly comfortable for a great night's sleep.

Insotect Flow technology is used in the Summit Park 15 Degree to help eliminate cold spots, regulate the movement of down inside the baffles and offer better body heat distribution. Strategically placed Flow Gate construction eliminates lateral and vertical down shifting by using vertical chambers with Flow Gates to control the position and density of the down insulation.

Big Agnes bags are not your traditional sleeping bags. Thanks to the Big Agnes System, Big Agnes bags are roomier and more comfortable than regular bags.

In a traditional sleeping system, the bag lies on top of a sleeping pad. In this configuration, many people find themselves rolling off the pad at night. Plus, the insulation on the bottom of the bag is compressed by the sleeper's weight. Once compressed, the fill loses the ability to insulate.

The Big Agnes System is different. Big Agnes joins the bag and pad together. The pad supplies the bottom insulation while the top 2/3 of the bag is insulated like a traditional sleeping bag. This design provides a secure foundation so you stay on the pad all night. You can roll freely, move into a fetal position, twist and turn without ever rolling off your pad. It also prevents the bag from twisting and engulfing you in an uncomfortable mess. Big Agnes uses this concept throughout their entire line of sleeping bags.

The Summit Park 15 Degree is designed to be used with the Big Agnes 25" wide rectangular sleeping pads. However, other branded pads with the correct dimensions (25" x 78") will also work.

Big Agnes bags weigh less and have more leg room than other comparable bags, which makes them more comfortable. They also pack down smaller and have much more room to stretch out. Sleeping in the Big Agnes System is like sleeping in a bed with the mattress under you for comfort and the covers for insulation.

Available in your choice of left or right side zipper, the Big Agnes Summit Park 15 Degree sleeping bag come in a single, long length (78"). A nylon stuff sack and a cotton storage sack are included.

  • Insotect Flow Construction: A flow-optimized insulation system that delivers uniform heat distribution and natural body contouring through a revolutionary baffling design that eliminates potential cold spots and down shifting
  • Integrated pad sleeve
  • Nylon stuff sack and cotton storage sack included
  • Built in pillow pocket holds a fleece or a Big Agnes pillow
  • Interior fabric loops for sleeping bag liners
  • Rectangular shape offers more room in the foot box and shoulders
  • 25" width offers extra girth
  • 70" YKK #8 zipper. Mate together Big Agnes bags with left and right zippers with the same size zipper
  • No-draft zipper tube insulates along length of the zipper
  • No-draft wedge insulates the connection between the bag and the pad
  • No-draft collar seals around neck to keep cold air from sneaking in
  • Down proof, Nylon microfiber Rip-stop shell with WR surface treatment to repel water
  • Soft, breathable down proof nylon lining with stain resistant finish
  • Nylon Rip-stop pad sleeve with WR surface treatment to repel water
  • Thermolite Quallofil synthetic insulation


Insulation Type Down
Recommended Use 3-Season Backpacking/ Camping
Warranty Lifetime
Type Goose Down
Temperature Rating 15 Degrees F
Shell Material Nylon Microfiber Ripstop
Packed Size 9" x 20"
Other Stuff sack included
Liner Material Nylon
Item Weight 3 lbs 10 oz
Fits to Length 6' 6"
Fits to Girth 56"
Fill Material 600 Fill

7 Item(s)

Likes: Excellent bag, used it for the first time when temperatures were dipping down to 30 at night. Well constructed with solid material. Plenty of room to move around is a big bonus.

Dislikes: Wish it was a little lighter

Reviewed by Inside Edge M. - March 11, 2015

Likes: My husband bought me this sleeping bag so we could zip his and mine together. We had a camp out in our living room and there was plenty of room for the both of us.

Dislikes: Wish it was cheaper in price.

Reviewed by Inside Edge M. - March 3, 2015

Likes: Wow, what a sleeping bag. I'm 6'2" 245 lbs and I had plenty of room in it.

Dislikes: As of now, nothing. Another great product from Big Agnes

Reviewed by Inside Edge M. - March 3, 2015

Likes: I love the sleep system from Big Agnes. The holder for the sleeping pad seems like such a simple idea you wonder why no one thought of it before. Super comfortable and as a side sleeper I love the extra room in these bags...plenty of space to be on my side and without ever sliding off the pad. Excellent!

Dislikes: Nothing

Reviewed by Inside Edge M. - December 6, 2014

Likes: I'm a big guy and cannot sleep on my back all night long. This bag is the only one I can find that is fairly light and yet roomy enough for my sleeping style. I like the Big Agnes integrated pad system as well. It keeps the bag on the pad where it should be.

Dislikes: I wish the zipper was slightly longer to open up more air at the foot box.

Reviewed by Cory E. - October 15, 2014

Likes: Light weight. Loved the bag. It never got down to 15 degrees while I've been using it. But it was in the 30's and I had to be in my boxers to not get all sweaty.

Dislikes: Zipper grabs the fabric more offten than I like, which is the only reason I didn't give it 5 stars.

Reviewed by Wyatt H. - August 21, 2014

Likes: Excellent, Love it! Fast shipping and wonderful service.

Thank you!

Dislikes: Love everything.

Reviewed by Lora P. - April 3, 2013