Waterbloc Pro -15°

The world's lightest weatherproof down sleeping bag

  • unique seam-welding technology keeps moisture out
  • ergonomic fit provides efficient insulation performance
  • water-repellent, vapor permeable Pertex Quantum Pro shell fabric
Waterbloc Pro -15° S left
Prod. no. 7640171999005
Waterbloc Pro Draft collar

The puffy draft collar prevents heat loss for cozy next to body warmth.

Waterbloc Pro Draft tube

The thick draft tube backing the zipper provides excellent heat retention. The anti-snag stiffener ensures smooth operation of the zipper.

Waterbloc Pro Footbox

Designed to cradle the feet in uncompressed insulation, this unique footbox eliminates cold spots. Internal baffles form a multi-faceted array of down chambers for extremely efficient heat conservation in this critical area.

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Glow in the dark zipper puller

Product description

The Waterbloc Pro -15° is the lightest, weatherproof down sleeping bag on the market. It is perfect for use in humid areas at low temperatures in winter.

Thanks to the newly patented STEALTH™ technology, the Waterbloc Pro provides an excellent sleeping experience in all weather conditions. The welded seams keep moisture out. The small pack size and discreet color also make it the perfect companion for bushcraft use, survival specialists and micro-adventures with a tarp as shelter. This allows nights in the open with out a bivybag.

The Waterbloc Pro features an ergonomic fit for enhanced insulating performance as well as a proportional differential cut. The 3D foot box with 11 individually filled down chambers ensures warm feet. A puffy draft collar retains warmth within the sleeping bag. Only RDS certified down is used in the Waterbloc Pro. All EXPED refrains from using environmentally damaging hydrophobic down treatments.

All EXPED sleeping bags in our Trekking, Basecamp and Expedition series can be paired with each other, with other EXPED models, as well as with most sleeping bags from other brands. Included with the sleepig bag is the waterproof stuffsack and the Storage Duffel as a storage bag.

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Fill weight

S: 29.3 oz
M: 30 oz
L: 31.4 oz


S: 74.8 in
M: 80.7 in
L: 86.6 in

Packed Dimensions

S: 10.6 x 6.7 x 5.9 in
M: 10.6 x 6.7 x 6.3 in
L: 10.6 x 6.7 x 6.7 in

Water resistance

Weather Resistant


S: 43.2 oz
M: 45.2 oz
L: 47.3 oz

Shoulder width

S: 61.8 in
M: 61.8 in
L: 62.6 in

Delivery contents

Sleeping Bag
Mesh storage bag

Color Inside


Up to body size

S: 67 in
M: 71 in
L: 77 in

Foot width

S: 39.4 in
M: 39.4 in
L: 39.4 in




Shell Fabric

20 D ripstop nylon Pertex Quantum Pro
1000 mm water column
MVTR 7000 g/m²/24h
bluesign® certified
PFC free


15 D ripstop nylon
Oeko-Tex® 100 certified
PFC free
DWR free


850+ cuin/oz European Goose Down (EN 90 / 10)
RDS certified
Oeko-Tex® 100 certified
PFC free


Product with Climate Contribution

EXPED calculates all climate emissions from the production and transportation of this product and finances certified climate protection projects through myclimate to an equal extent.


Responsible Down Standard (RDS)

RDS is the strictest standard for animal welfare in the production of down. EXPED uses 100% certified down in all down products.

more about RDS

Oeko-tex certified material

Oeko-Tex® is a testing and Certification system for raw materials and finished products. EXPED does not feature fully tested products. The listed products aren't certified under this standard. Only accordingly specified materials are certified.


Bluesign certified material

Bluesign®, the world's strictest textile standard for environmental protection and consumer protection in textile production. The listed products aren't certified under this standard. Only accordingly specified materials are certified.



Abbreviation for Per- or poly fluorinated chemicals, also known as fluorcarbons. Non degradable and accumulating toxic chemicals used for waterproofing.

Warranty years

5 Years


What are EN values for sleeping bags?

The EN (European Standard) rating is a rigorous test designed to set measurable goals and standardize the marketing of sleeping bags. It is designed to help consumers make an informed decision by using independently derived temperature ratings.

Each EN sleeping bag test results in four temperature ratings - upper limit, comfort, lower limit and extreme, with the following definitions:


From Wikipedia:

Upper limit - the temperature at which a normal man* can sleep without excessive perspiration. It is made with the hood and zippers open and with the arms outside the pocket.

Comfort - the temperature at which a normal woman* can expect to sleep comfortably in a relaxed position.

Lower limit - the temperature at which a normal man can sleep in a curled position for eight hours without waking up.

Extreme - the minimum temperature at which a normal woman can stay for six hours without risk of death from hypothermia (although frostbite is still possible).

For the purpose of these measurements, it is assumed that a "normal man" is 25 years old, 1.73 m tall, and 73 kg; a "normal woman" is 25 years old, 1.60 m tall, and 60 kg.

The three most common ratings are comfort, (lower) limit, and extreme. For men's bags, most companies advertise the Limit rating, and for women's bags, the Comfort rating, although it can vary."

How should I store my sleeping bag?

It is best to store the sleeping bag in the mesh storage bag provided. This will ensure that the insulation retains its maximum bulk and thermal performance. When traveling, it is okay to compress the sleeping bag and carry it in the included stuff sack.

When you return from a trip, it is very important to let your sleeping bag dry completely. Then store it in the mesh storage bag in a dry and temperature controlled place.


How do I wash my sleeping bag?

If you wash your sleeping bag too often, the insulation can suffer (down or synthetic). The insulating power may decrease. We recommend cleaning the sleeping bag with a damp sponge. If the sleeping bag needs a more thorough cleaning, use only a front-loading machine (no agitator!) and a special detergent from Nikwax or McNett.

Before you put the bag in the washing machine, close the zipper. Use a cold water and gentle wash cycle, and after the wash cycle is complete, run a second rinse cycle without detergent. This will ensure that all detergent residue is removed. Two spin cycles will help get a lot of moisture out of the sleeping bag.

It is best to hang the sleeping bag afterwards and air dry it. Keep massaging the sleeping bag the down tufts apart. Depending on the humidity, it may take several days to dry completely. If you need to dry it faster, use a tumble dryer on low heat (often there are special down drying programs). To loosen up the down in the dryer, you can put some tennis balls in the dryer with it.