Best Sea to Summit Mummy Sleeping Bags of 2026

The SEA TO SUMMIT Spark Bag is engineered specifically for women, featuring a tailored design that offers enhanced warmth and heat retention. With its premium Ultra-Dry Goose Down insulation, this sleeping bag guarantees a fantastic warmth-to-weight ratio, ensuring you stay comfortable on cooler nights. Weighing only 584g, it is ultra-light and easy to carry, making it perfect for backpacking or bikepacking trips. Additionally, the compact design allows you to pack it down easily, so you can focus on your adventures without the bulk.

The Sea to Summit Cinder Quilt is a lightweight, compressible down quilt designed for two-season use in cool weather. It keeps you comfortable at temperatures as low as 35 degrees Fahrenheit (-2°C), ideal for backpacking, hiking, bike packing, and travel. Its 750 fill power down insulation is treated with ULTRA-DRY Down, helping it resist moisture and maintain loft and warmth even in damp conditions. The quilt features a waterproof and breathable 20D nylon shell and soft nylon lining, making it durable yet comfortable, while the sewn-through quilted design keeps weight and bulk to a minimum, perfect for active outdoor use.

The SEA TO SUMMIT Down Sleeping Bag is designed specifically for women, featuring a tailored shape for enhanced warmth and comfort. With premium 650+ Loft Ultra-Dry Duck Down insulation, you can expect superior heat retention, perfect for chilly nights. It is rated to -1°C, making it ideal for unpredictable weather conditions. Plus, its compact and lightweight design allows for easy packing and transport, ensuring you can enjoy your adventures without the bulk of heavy gear.

The Sea to Summit Spark SpIII is an excellent choice for those seeking warmth and comfort during outdoor adventures. Its down treatment ensures maximum insulation, keeping you cosy even in cooler conditions. The contoured mummy shape is designed to efficiently trap warmth, ensuring you stay snug all night long. This sleeping bag is ideal for camping, backpacking, or any outdoor activity where light weight and warmth are essential. With the Spark SpIII, you can enjoy restful nights under the stars.

The Sea to Summit Ascent AcI is a versatile down sleeping bag designed for mountaineering and trekking. It comes with a handy storage bag, making it easy for you to pack and carry. You can also use it as a blanket for added comfort during breaks or cooler nights. The lined cover strip offers extra warmth and protection, enhancing your sleeping experience in cold conditions. This sleeping bag is treated with DWR impregnation, helping to repel water and keep you dry on your adventures.

The Sea to Summit ThII Sleeping Bag features innovative WaveLoft construction, which enhances air-trapping to keep you warm during your adventures. Its quality DWR-treated nylon shell repels moisture, ensuring you stay dry even in damp conditions. The comfortable 20D nylon liner fabric adds to your sleeping comfort, making for a restful night. Additionally, the full-length YKK zip allows for increased ventilation and versatility, enabling you to use the bag as a quilt or comforter when needed.

The SEA TO SUMMIT Down Sleeping Bag is specifically engineered for women, providing extra insulation in key areas for enhanced warmth and comfort during chilly nights. With its premium 650+ Loft Ultra-Dry Duck Down filling, you can enjoy superior warmth and durability. Rated to -9°C, this bag is ideal for three-season use, ensuring you stay cosy even in unpredictable weather. Additionally, the compact design allows you to easily pack it down for trekking or camping, making it a perfect travel companion.

The EMBER EbII R Sleeping Bag features an ultra-light 10D outer and 7D inner material, making it easy to carry and pack away. It is filled with RDS certified 850+ Loft Premium Goose ULTRA-DRY Down, providing excellent insulation to keep you warm in chilly conditions. With versatile adjustment options, you can easily adapt the bag for various weather scenarios. Additionally, two EMBER bags can be linked together, allowing you to create a spacious double blanket for a more comfortable sleep experience.

The Sea to Summit Quest QuI is a synthetic sleeping bag designed for women, ideal for 2-season backpacking and travel with comfort down to 37°F (3°C). Its relaxed mummy shape includes a shaped hood and zipper draft tubes to keep you warm by reducing heat loss. The synthetic polyester insulation uses WaveLoft construction, which maximises loft and traps warm air effectively, ensuring you stay cosy. Additionally, the insulation is tailored to a woman’s body, enhancing warmth where you need it most for a better night's sleep.