Rab Mythic Ultra 120 Modular Down Sleeping Bag (0C)

The award-winning Mythic Ultra 120 Modular is designed to minimise weight and bulk by providing insulation only where it is not already supplied by a sleeping mat. The upper section of the bag and the underside of the legs are filled with ultra-high-loft 900FP down and heat-reflective TILT, effectively reducing radiant heat loss without adding unnecessary grams. Meanwhile, the lower section wraps around the sleeping mat, ensuring insulation from the ground without excess material.

With its incredibly compact pack size and exceptional comfort, this sleeping bag is an ideal companion for long-distance treks, bikepacking adventures, and multi-day mountain runs.

Featuring a lightweight stitch-through construction, the down is strategically positioned to maximise warmth while keeping bulk to a minimum. A back harness secures the bag to the sleep mat, and insulated side baffles align with the mat’s edges to eliminate cold spots. A diagonal zip has been chosen to facilitate easy access and exit, while also offering ample ventilation for warmer summer nights. The hood sleeve doubles as an ultralight pillow compartment, allowing clothing to be stored inside for added comfort while streamlining the kit list.

Each Mythic Ultra 120 Modular is hand-filled in the UK, ensuring that the down remains uncompressed prior to use, preserving its loft for its first adventure.

Due to its unique construction, this sleeping bag does not meet the requirements for an EN test. Instead, sleep limits are based on extensive experience, supplementary testing, and feedback from athletes and test teams. More information about the Rab Sleep Limit can be found at Rab Lab.

Features

• The combination of TILT technology and 900FP down in the upper section and lower legs delivers an impressive warmth-to-weight ratio.
• An integrated mat sleeve secures the uninsulated portion of the bag to an air mat for efficient thermal performance.
• The Rab sleep limit of 0°C (32°F) is achieved when used with an air mat rated R4 or higher.
• A diagonal zip entry, featuring a YKK® two-way zip, provides easy access and allows for versatile ventilation.
• The pillow sleeve is designed to accommodate folded clothing, creating an ultralight alternative to a traditional pillow.
• A down-filled anti-snag zip baffle prevents draughts and enhances insulation.
• A lightweight roll-top compression sack is included for compact storage.
• Each bag is meticulously filled in Derbyshire, UK, ensuring premium quality and performance.
• The optimally filled, stitch-through construction keeps weight to a minimum while maintaining warmth efficiency.
  
  

Sustainability Features

• Fluorocarbon (PFAS) free fabric
• Fluorocarbon (PFAS) free product
• Greater than 50% recycled materials
• Made with renewable energy
  
  

Specifications

Size Guide

Technology

TILT (Thermo Ionic Lining Technology)

This innovative heat-retention technology functions similarly to an emergency blanket by reflecting body heat back towards the wearer while still allowing for breathability and comfort. By enhancing thermal efficiency, it provides essential warmth when temperatures drop significantly.

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