Sea to Summit Alpine AP II


spring 2011 regular long
Weight 2 lb 14 oz / 1290 g 3 lb 3 oz / 1450 g
Fill weight 1 lb 9 oz / 710 g 1 lb 12 oz / 780 g
EN comfort 16 F / -9 C
EN lower limit 5 F / -15 C
EN extreme -31 F / -35 C
Fill 850-fill down
Shape Mummy
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

sponsored links
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.

Manufacturer's Description

Visit Sea to Summit's Alpine AP II page.

Retailers' Descriptions

Here's what other sites are saying:

Features of the Sea to Summit Alpine APII 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

- Moosejaw

Built for cold-weather backpacking and ski touring trips, the Alpine ApII Sleeping Bag compresses down small and has warm 850-fill goose down that's treated to shield against moisture.


By using the highest quality 850+ European down fill, Sea to Summit was able to get the Alpine ApII down sleeping bag under 3 lbs, an impressive feat for a full-feature winter mountaineering bag. Contoured 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 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 loft 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''

- OMCgear

Even with all its insulating awesomeness, down is pretty much worthless when wet. That's why the Sea To Summit Alpine ApII 5-Degree Down Sleeping Bag uses 3D Nano Shell to stop both external and internal moisture, because even water vapor produced by your body while you sleep can be a dampener. And the miraculous 850-fill Ultra-Dry Down repels moisture to retain loft that will keep you warm on extended trips during the coldest months. Baffled construction, cushioned hood, and zipper and neck draft tubes further ensure head-to-toe comfort.


Sea to Summit Alpine AP II

previously retailed for:
$324.83 - $669.00

The Sea to Summit Alpine AP II is not available from the stores we monitor. It was last seen April 5, 2018 at Moosejaw.

Recently on Trailspace

Meet Patman: Lover of Mountains and Trip Reporter Extraordinaire

Oboz Men's Campster Review

Larabar Apple Pie Review

3F Gear Lanshan 2 Review

Osprey Ultralight Stuff Pack Review

Wilderness Systems Pungo 120 Review