Mammut · Sleeping Gear
Relax Fiber -2C/28F Sleeping Bag - Women's

$208.89
$282.15Save $73.26 (26%)
at REI
Price Historylast 2 months
Low $208.89 · High $208.89. Hover the line to see each change.
Is this a good deal?
- The current price has held for 47 days.
- Across the 30 Sleeping Gear deals we’re tracking right now, the median discount is 37% — this deal’s 26% off is below that mark.
Based on prices we’ve recorded from REI since July 2026, refreshed several times daily.
About this product
The Mammut Relax Fiber -2C/28F is a women's synthetic sleeping bag designed for backpacking and camping, with an EN-tested lower limit of 28 degrees Fahrenheit (negative 2 degrees Celsius) and a comfort rating of 37 degrees Fahrenheit. Its semirectangular shape is tailored for an optimized women's fit, with a shoulder girth of 66.93 inches, hip girth of 59.1 inches, and a length accommodating sleepers up to 80.71 inches. The Ajungilak synthetic polyester fill resists moisture and simplifies care, while the shell is constructed from polyamide and the lining from 100 percent recycled polyester. A PFC-free durable water repellent treatment adds weather resistance. The central two-way YKK zipper, complete with a zipper garage and insulated draft tube, allows intuitive temperature regulation without cold spots. A soft hood lining reduces noise, and an insulation chamber around the hood opening blocks wind and cold. The revised anatomical footbox adds comfort without extra weight. Packed weight is 907 grams, and the bag compresses to roughly 10.7 liters. An internal pocket, sleep mask, and earplugs are included.
- Category
- Sleeping Gear
- Brand
- Mammut
- Material
- Liningfrom 100% recycled polyester, Polyester, Polyamide
- Color
- RENAISSANCE
- Size
- Regular - Center Zip
- Fill
- Polyester
- Shell
- Polyamide
- Gender
- Women's
- Lining
- Polyester
- Weight
- 2 lbs. 11.39 oz.
- Best Use
- Backpacking
What people are saying
Reviewers consistently praise the Mammut Relax Fiber -2C Women's bag for its comfort-focused, spacious fit and the distinctive central zipper, which makes entry and exit easy and allows precise temperature regulation. The quiet, soft shoulder and neck lining earns repeated compliments, as does the moisture-resistant Ajungilak synthetic fill and the anatomical footbox that adds room without extra weight. It is widely recommended for warm-weather camping, car camping, and camper van trips. The most common criticism is that the roomy cut, while comfortable, can reduce thermal efficiency, and cold sleepers are cautioned that the bag sits right at its rated limit in near-freezing conditions. The synthetic fill also means it is bulkier and heavier than comparable down options.
Specifications
- Packed weight
- 907 g
- Temperature rating
- -2°C
- Sleeping capacity
- 1
Related Guides
Less Gear, More Trail: A Minimalist Approach to Backpacking
How to build a lightweight backpacking kit on a budget. Practical minimalist gear philosophy, smart swaps, and where to find deals on proven gear.
The Beginner's Complete Camping Gear Checklist (With Live Prices)
Everything you need for your first camping trip — tent, sleeping bag, pack, kitchen, and more. Real prices tracked across outdoor retailers.



