Sea to Summit Alpine APIII Sleeping Bag

No Reviews

Select a Size

When will I get my stuff?

"In Stock" means this item is ready to ship. Orders placed before 3pm EST using Ship Speeds of 1-5 Days will ship SAME DAY. Orders using 5-10 day shipping will ship within one business day.

"Ship Date" means we'll special-order the product for you and this is the date we expect your shipment to leave our warehouse.

"Oversized" means the item is too large for 5-10 Day Shipping (Free over $49) and can only be shipped via 4-5 Day Shipping. Additional shipping charges may apply.

"Freight" means the item is too large for 5-10 Day Shipping (Free over $49) and must be shipped by truck freight for an additional fee. Someone must be present to accept delivery so we will call to schedule.

If you have any questions, please Live Chat one of our sort of smart customer experience personnel. If you are one of the few that enjoy speaking to real human, please call 877-666-7352

Add to Cart
+ earn up to $79.90 in Rewards
Moosejaw Rewards: You earn MJ$10 for every $100 you spend on or at our shops (MJ$2.50 for discounted items).

So if you buy a $200 jacket at, you can turn around and get a $20 tee using your Rewards on

You are signed up automatically when you give your email address and you’ll earn points as you shop. So easy.

For full program info, see:
Rewards Program Details
Add to Wish List
- +
Product Description Item No.   10243748

The Sea to Summit Alpine APIII Sleeping Bag is a high altitude sleeping bag for expeditions in arctic conditions. The APIII is rated down to -4 degrees Fahrenheit, packed full with 850+ fill ULTRA-DRY down, treated for water resistance. The contoured mummy shape wraps around your body with a neck collar and draft tube to prevent the cold from leaking inside. At 3 pounds, 9 ounces (regular), you won't mind carrying it on all of your winter adventures.

FEATURES of the Sea to Summit Alpine APIII Sleeping Bag

  • 3D NanoShell
  • 850+ Loft ULTRA-DRYDown 90° Down Cluster Premium European Goose Down
  • Security pocket located inside the bag is easily accessible
  • Side block baffle construction resulting in more down located in the top of the bag for maximum insulation
  • Oversized neckcollar and hood-seal
  • Contoured mummy fit and anatomical shaped foot box
  • Includes lightweight Ultra-Sil compression bag, mesh storage cell and laundry bag

- + Product Specifications
Fill Weight (Regular): 32.8 oz
Product Technology: Sea to Summit 3D Nano Shell, Sea to Summit ULTRA-DRY Down
Gender: Mens
Features: Draw or Cinch Cord, Draft Collar, Water Resistant, Stuff Sack Included
Best Use: Backpacking, Winter Camping, Basecamp and Expedition, Mountaineering and Alpine, Travel
Exact Temperature Rating: -4 Degrees Fahrenheit
Sleeping Bag Shape: Mummy
Max User Height (Regular): 6 Feet
Bag Weight (Regular): 3 lbs, 8 oz
Fill Details: 850+ Loft ULTRA-DRY Down
Zipper Side: Left
Insulation: Down
Temperature Rating: -50 - -1 Degrees Fahrenheit
3D Nano Shell

3D Nano Shell
3D Nano Shell is a protective layer between an outdoor enviroment and the soft, fluffy down of a Sea to Summit sleeping bag. The NanoShell fabric face is windproof and water repellent, while the 3D barrier of non-woven silicone encapsulated layer allows vapors and condensation to pass through. This combination allows the bag to breath from the inside out, while external wind or water can't get in. Simply put, it'll protect the down so the down can keep you warm.

Sea to Summit ULTRA-DRY Down

Sea to Summit ULTRA-DRY Down
ULTRA-DRY Down is a treated insulator for Sea to Summit sleeping bags. ULTRA-DRY treated down repels moisture, so when your environment is damp, your gear stands a much better chance. The down will retain its loft, dry faster and is even anti-bacterial and anti-microbial, improving their life span. When conditions are bad, your bag doesn't have to be.

Free Shipping
Spend $12 in Moosejaw products OR at least $49
in other products and you orders ships FREE!

Moosejaw Rewards
You earn MJ$10 for every $100 you spend on or at our shops (MJ$2.50 for discounted items). That's like getting 10% back in Rewards!

What are you looking for?
Shopping Cart