Millet Light Down 0° Review

Overview

The Millet Light Down 0° is a three-season mummy bag built for mountain bivouacs and summer trekking, with a 5°C comfort rating and a 0°C limit. Its selling point is K Dry, Millet’s water-repellent treatment for the down, which suits the tent condensation and pre-dawn mist of the Alps and Pyrenees. The trade-off is the fill: 700-fill duck down puts the bag at 710–730 g, heavier than the best ultralight bags with similar ratings.

Key Specs

Spec	Value
Weight	710–730 g (25.0–25.8 oz) depending on version
Comfort / Limit / Extreme	5°C / 0°C / -16°C (41°F / 32°F / 3°F)
Insulation	K Dry duck down, RDS-certified, 90% down / 10% feather
Fill power	700 FP
Down weight	350 g
Construction	H-chamber baffles
Shell	20D polyester ripstop, PFC-free water-repellent finish
Packed volume	3.5 L (30 × 16 cm compression sack)
Length	215 cm
Max user height	185 cm (6’1”)
Shoulder width	80 cm
Zip	3/4 side zip, two-way slider, left-hand
Extras	Draft flap, insulated collar, double-drawcord hood, inner pocket, mesh storage sack

Performance

Warmth. The numbers set the expectations. At the 5°C comfort rating, a relaxed sleeper on their back should stay warm. At the 0°C limit, a sleeper has to curl up to hold heat. The -16°C extreme figure is a survival threshold and not a planning number. Cold sleepers should treat this as a summer and shoulder-season bag and carry a base layer for nights near freezing. Owners report better results than the ratings suggest. One German buyer spent a night outdoors in a barrel-style bivouac at -1°C and called the bag warm. An Italian buyer found it very warm over an inflatable pad.

K Dry down. Millet treats the down itself with a PFC-free water-repellent finish, and the shell has its own coating. The aim is a bag that resists absorbing moisture and dries quickly when condensation or humidity gets in. Retailers pitch it as protection against morning dew and tent condensation. It buys margin in a damp bivouac. It doesn’t replace a waterproof shelter, and a soaked down bag is still a problem.

Fill power and weight. The 700 FP duck down is what holds the bag back. Higher-fill goose down gives the same loft from less material, which is why lighter bags at this rating exist. About 350 g of the total weight is down. Millet’s own price is €280. At that price, the fill is the weak spot.

Construction. H-chamber baffles use internal walls instead of stitched-through seams, so there are no thermal bridges and the down stays where it’s placed. It’s the classic design for a bag aimed at comfort and compressibility. The 20D ripstop shell is sturdier than the 10–15D fabrics on race-weight bags, and it’s part of why the weight stays above the ultralight benchmark.

Fit and features. The cut is a standard mummy with 80 cm shoulders and 215 cm of length, sized for users up to 185 cm. The 3/4 side zip keeps the foot box sealed and saves a little weight. The cost is ventilation, because the bag can’t be opened flat on a warm night. The two-way slider lets sleepers crack it from the bottom. An internal draft flap covers the zip, and the collar and double-drawcord hood close the neck. Owners single out the finishing: an inner pocket, glow-tipped zipper pulls, and a mesh storage sack. Buyers also praise the small, light packed size.

Packed size. At 3.5 L, the bag fits a 30 × 16 cm sack. That’s compact enough for the bottom of a 40–50 L pack. It isn’t the smallest in its class.

Choosing a Version

Both listed versions are the same bag. The 710 g and 730 g versions share the same temperature ratings, 3.5 L packed volume, 215 cm length, 80 cm shoulders and 185 cm height limit. They also share the same 90/10 duck down fill and 3/4 side zip. The 20 g gap (under an ounce) is too small to affect warmth, fit or packed size. Retailer listings for the bag run slightly higher, up to 740 g, which suggests unit-to-unit variation.

Buy whichever is in stock. A hiker who is counting every gram should check the actual weight on a scale before the first trip.

Pros & Cons

Pros

• K Dry treatment on both the down and the shell resists damp, condensation-prone conditions
• H-chamber baffles avoid cold spots without adding bulk
• Draft flap, insulated collar and double-drawcord hood seal in heat at the limit rating
• Two-way 3/4 zip gives some venting while keeping the foot box warm
• RDS-certified down and PFC-free finish
• Ships with a compression sack and a mesh storage sack
• Owners report good warmth and a small packed size

Cons

• 700 FP duck down means worse warmth-to-weight than higher-fill goose down bags
• 710–730 g is heavy for a 0°C-limit bag by ultralight standards
• A 5°C comfort rating leaves cold sleepers needing a base layer on mild nights
• The 3/4 zip limits ventilation on warm nights
• The left-hand zip and 185 cm height limit rule out taller or right-zip-preferring sleepers
• €280 is a lot for the fill power

Who Should Buy This

The Light Down 0° suits the alpine trekker doing multi-day routes where summer nights approach freezing and tents drip by morning. It also fits hut-to-hut hikers and bikepackers who want a compact down bag that tolerates damp. Thru-hikers chasing the lowest base weight should look at 800-fill-plus goose down bags. Hikers over 185 cm, and anyone who sleeps cold, need a longer or warmer bag.

Verdict

The Millet Light Down 0° is a well-made, damp-tolerant mountain bag with good features and credible environmental credentials. The 700 FP duck down costs it weight and value against lighter, similarly priced rivals. It earns a 6.5 out of 10: a sound choice for wet alpine use and a poor one for hikers who count grams.