Sea to Summit Sleeping Bag and Quilt Ranges Explained
Posted by Mark Richardson on Aug 07, 2026
Spark
A True Minimalist Bag
The Spark sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront. The optimal warmth to weight ratio and 850+ FILL Power makes this bag as comfortable as it is compact and easily packable.
The Spark Women's sleeping bag is specifically designed for women, with added warmth and heat retention for versatility and functionality. Featuring an optimal warmth to weight ratio, the Spark Women's bag is equally compact and comfortable.
Spark 7°C/45F (Comfort Limit: 7°C & Weighs: 363g)
Women's Spark 7°C/45F (Comfort Limit: 4°C & Weighs: 411g)
Spark -1°C/30F (Comfort Limit: -1°C & Weighs: 498g)
Women's Spark -1°C/30F (Comfort Limit: -1°C & Weighs: 591g)
Spark -9°C/15F Down (Comfort Limit: -8°C & Weighs: 797g)
Women's Spark -9°C/15F (Comfort Limit: -15C & Weighs: 947g)
Spark -18°C/0F (Comfort Limit: -18°C & Weighs: 1118g)
Spark -9°C/15F Double (Comfort Limit: -8°C & Weighs: 1612g)
Ember Quilts
Ultralight Construction
An Ember quilt can be an ideal light and packable option for bikepackers, ultralight hikers and travellers. Constructed using high quality 850+ loft Ultra-Dry Down and featherweight fabrics, this well-constructed quilt offers freedom from the weight of a sleeping bag zip and from the constriction that comes with some sleeping bags.
The Ember Series takes the simplicity of the quilt concept a step further - snap-on attachment straps keep your quilt located on your sleeping mat, while the drawcord base of the 50°F and 35°F give the Ember a 'shape-shifter' function: Wider at the base for more freedom of movement when it's warm, snugged down when it's cooler.
Traveller
Flexible Quilt/Sleeping Bag Option
This aptly named sleeping bag and down blanket is the traveller's best friend. Whether you are on a summer bike tour, or a hut trip, or couch-surfing, or simply stuck at an airport or ferry terminal, the Traveller unpacks from an almost impossibly small compression sack to reveal a rectangular sleeping bag.
The Traveller completely unfolds to make a quilt or with a zip and foot drawcord can be converted to a sleeping bag.
Spark Pro
Upgrded Spark with 900+ FP
The Spark Pro sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront. With the ability to be adapted to a range of conditions, the Spark Pro is as lightweight as it is versatile and functional. The optimal warmth to weight ratio makes this bag as comfortable as it is compact and easily packable.
Ascent
Comfort Shape & Innovative Venting
The Ascent Sleeping Bag is the most versatile in our sleep range and is suited to a multitude of climates, conditions, and adventures. From long distance hiking to weekend getaways, the ultra lightweight 750+ FILL Power offers added warmth in cooler climates, while the Free Flow Zip System allows for added air flow and ventilation in warmer climates. Putting comfort and adaptability at the forefront, the Ascent Sleeping Bag is a premium option for versatile adventures.
Circuit
Roomy, Adaptable Quilt-Like Design
Adapt to any adventure. The Circuit’s semi-tapered-rectangular shape fits you and fits your travelling, camping and backpacking lifestyle. Its extra width allows you to sleep on your side, wrapped in 650+fillpower down and soft-touch fabrics. As the weather warms, the wraparound zip lets you ventilate the bag from top to bottom, and even open it as a fully flat quilt. Sea to Summit design and quality, non-PFAS recycled materials and ISO-tested performance make this light, packable bag the perfect travel companion.
Trek
Comfort Shape and 650+ FP Down
The Trek down sleeping bag brings the comfort of a tapered-rectangular mummy shape and the versatility of a dual-zip ventilation system to wherever your travels may take you. The full-length side zip and secondary foot box zip allow you to increase ventilation or open the Trek completely flat like a comforter, and the quality down will keep you warm and snug on chilly nights.
The broader mummy cut gives you room to move inside the bag, regardless of your sleeping position. The semi rectangular shape feels more spacious, and it also has the flexibility to convert to a quilt.
Hamelin
Versatile, Roomy and Reliably Warm
A backpack-capable sleeping bag with a higher level of comfort than traditional mummy bags. For a few extra grams and larger packed size, Hamelin brings the benefits of synthetic insulation in wet/sandy environments. Designed for comfort and performance, the relaxed mummy fit offers plenty of room to move. The full-length side zipper extends throughout the foot box, along with a half-length zipper on the opposite side it provides ventilation and versatility.
Hamelin -1C/30F Synthetic Sleeping Bag (Comfort Limit: -1°C & Weighs: 1189g)
Women's Hamelin -1C/30F Synthetic Sleeping Bag (Comfort Limit: 3°C & Weighs: 1479g)
Hamelin -9C/15F Synthetic Sleeping Bag (Comfort Limit: -9°C & Weighs: 1626g)
Women's Hamelin -9C/15F Synthetic Sleeping Bag (Comfort Limit: -9°C & Weighs: 1953g)
Boab
A Balance of Comfort & Conscious Design
The Boab is a great choice for campers and vehicle-based adventurers looking for a roomy, comfort-oriented sleeping bag. A #5 zipper continues through the footbox, and the double sliders mean the zipper can be opened in either direction for ventilation. For the warmest nights, open the Boab flat as a quilt.
The shell and liner are made from 50D recycled polyester with a PFAS-free water-repellent finish. Both fabrics are soft to the touch yet feel tough enough for repeated use. Insulation is reliable into the low single digits, and the offset synthetic fill does a solid job of minimising cold spots. The full-length zip includes a plough to reduce snagging and allows the bag to compress surprisingly well for a synthetic model.
Alpine
For Arctic-level Temperatures or High-Altitude Adventures
The Alpine sleeping bag features the highest quality Ultra-Dry down and a contoured mummy fit for efficient insulation. With space to cater for additional winter gear and 850+ FILL Power, this lightweight sleeping bag is best suited to extreme adventures in cold climates so you can enjoy the outdoors with confidence and peace of mind.
We stock the key ranges of Sea to Summit sleeping bags, find out which they are, our opinion and what they do on this page. — The Spark sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront. The optimal warmth to weight ratio and 850+ FILL Power makes this bag as comfortable as it is compact and easily packable. The Spark Women's sleeping bag is specifically designed for women, with added warmth and heat retention for versatility and functionality. Featuring an optimal warmth to weight ratio, the Spark Women's bag is equally compact and comfortable.