Best Marmot Mummy Sleeping Bags of 2026

The Marmot NanoWave 35 is a versatile mummy sleeping bag designed for three-season use. It features synthetic Spirafil High Loft insulation, ensuring you stay warm and comfortable during your camping or trekking adventures. The anatomically optimised fit enhances insulation in the head and foot areas, providing extra comfort as you sleep. Additionally, the breathable and windproof 50D nylon Ripstop outer material includes an extra zipper for ventilation, making it adaptable to changing temperatures.

The Marmot NanoWave 45 is an ultra-light mummy sleeping bag designed for summer camping and trekking. Its synthetic Spirafil High Loft insulation ensures maximum warmth while keeping the bag lightweight, making it easy to carry on your adventures. With an anatomically optimised fit, you'll enjoy improved comfort and insulation, particularly around the head and feet. The breathable 50D nylon Ripstop outer material is windproof, providing extra protection against the elements, and the additional zipper allows for ventilation when needed.

The Marmot Voyager 55 is a mummy-style sleeping bag designed for backpacking and outdoor adventures. Its SpiraFil high-loft insulation ensures maximum warmth and durability, keeping you cosy even in cooler conditions. Weighing only 1 pound, 8 ounces, it's highly compressible, making it perfect for those who need to save space and weight on their travels. The full-length, locking YKK two-way zipper adds convenience, allowing you to easily enter and exit the bag while ensuring a secure closure during use.

The Marmot Sawtooth Sleeping Bag is filled with premium 650 duck down, offering excellent warmth even in temperatures as low as -28°C, making it ideal for cold conditions. Its curved down chambers keep the insulation evenly distributed, so you stay cosy throughout the night. The mummy shape is tailored around the head and foot areas to provide a snug fit, improving insulation and comfort while you sleep. Additionally, the outer shell is made from breathable, windproof 20D nylon ripstop with a DWR treatment, helping keep moisture out and ensuring you stay dry and comfortable.

The Marmot Lost Coast 5 is a lightweight mummy sleeping bag filled with 600+ duck down, offering excellent warmth and packability. Its 600+ Fill Down with Down Defender improves performance even in damp conditions, ensuring you stay comfortable. The four-season design features an anatomically optimised fit around the head and feet to keep you cosy and well insulated throughout the night. Made with 100% recycled polyester ripstop, the outer fabric is breathable, windproof, and treated to resist moisture, helping you stay dry and comfortable in varying weather.

The Marmot Ironwood Sleeping Bag offers a lightweight, mummy-style design with an anatomically shaped footbox that gives you extra room to stretch your feet, ensuring a better night's sleep with added comfort and warmth. It is tested to keep you warm in temperatures as low as 30°F, featuring 650-fill power down with Down Defender to resist dampness, perfect for chilly or damp nights. The bag includes a snagless insulated draft tube and a full-length, locking YKK two-way zipper with an anti-snag slider, making it easy to use without catching on your clothing. Additionally, an internal stash pocket lets you keep important items close at hand, while hang loops and a stuff sack add convenience for storage and transport.

The Marmot Ouray Sleeping Bag is designed to keep you warm in extreme cold, thanks to its premium 650 duck down filling and straight down chambers that prevent heat loss. Its four-season capability means you can use it year-round, with an anatomically shaped fit around the head and feet for improved comfort and insulation. The breathable, windproof 20D nylon ripstop outer fabric is treated with DWR to resist moisture, helping you stay dry. Additionally, the draft collar and hood offer extra warmth, making it perfect for cold-weather adventures.