|Weight||3 lb 8 oz / 1580 g||3 lb 15 oz / 1790 g|
|Fill weight||2 lb 1 oz / 930 g||2 lb 3 oz / 1000 g|
10 F / -12 C
|EN lower limit||
-4 F / -20 C
-44 F / -42 C
|Max user height||6 ft 0 in / 185 cm||6 ft 8 in / 205 cm|
|Shoulder girth||60 in / 152 cm||61 in / 156 cm|
|Hip girth||51 in / 130 cm||54 in / 136 cm|
|Foot girth||41 in / 104 cm||42 in / 107 cm|
Where to Buy
Help support this site by making your next gear purchase through one of the links above. Click a link, buy what you need, and the seller will contribute a portion of the purchase price to support Trailspace's independent gear reviews.
Here's what other sites are saying:
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 90Adeg 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
Nothing takes the steam out of your engine more than a restless night, so Sea To Summit designed the Alpine ApIII -4 Degree Down Sleeping Bag to both repel outside moisture and prevent condensation build-up on those epic alpine expeditions. A breathable, downproof 3D Nano Shell with Nano DWR and an interior barrier ensure its plentiful 850-fill Ultra-Dry Down stays lofty and toasty-warm, even at high-altitude base camp. Because you want to be rested for that glorious peak.
Filled with high-quality 850+ fill-power Ultra-Dry Down(TM) European goose down, the Alpine APIII sleeping bag is your cocoon at high altitude or in severe cold.
Ready for expeditions in the Karakoram, the Sea to Summit Alpine ApIII is chock full of features to make your tent away from home warm and comfortable. The ApIII will impress ski mountaineers, avid winter campers, and expeditioneers with its ability to withstand humidity day after day. Lightweight 3D NanoShell(TM) shell uses Nano Durable Waterproof Repellent (DWR) to provide a high level of water repellency while 3D Barrier promoting fast evaporation to keep humidity from affecting down loftContoured mummy shape is cut with a fitted hood, broader shoulder and large chest to maintain thermal efficiency and to accommodate extra layers in cold conditions Differential allows lining to conform to your body without overlaps or gaps to eliminate cold spots Offset baffle construction allows down to maintain full loft and minimize loss of heat through the seam lines Side block baffle technique allows a 60-40 (top-bottom) fill ratio keeps top down uncompressed and you warmer Anatomically tapered foot box accommodates the natural position of the feet and is roomy enough for liners Soft touch lining is down proof by construction, highly breathable and durable Oversized neck collar, draft tube, and cushioned internal hood seal with dual adjustments keep drafts out Anti-snag zipper system uses a high-density poly cloth hidden in the draft tube for smooth, snag-free zipping Full length, two way zipper side and foot zip allow not only infinite ventilation, but conversion from a traditional mummy to a flat duvet YKK #5 zippers allow this bag to unzip from the top and bottom for ventilation or to be used with another Sea To Summit bag (Trek, Traverse, and Alpine) of any size to create a double bag Medium sized internal pocket is great for storing electronics to preserve battery life in cold conditions Ultra-Sil(R) compression sack packs down from 15L to 5L Compression sack, mesh storage sack, and laundry bag included Max user height recommendations - 6'0'' Long - 6'7''
Sea to Summit Alpine AP II
Sea to Summit Basecamp Bc III
Sea to Summit Latitude Lt III
Sea to Summit Micro MC III
$337 - $448
Western Mountaineering MegaLite
Western Mountaineering VersaLite
NEMO Strato Loft 25
$262 - $349
$399 - $499