Lucy Wallace awards the Sea to Summit Boab -1 sleeping bag her highest accolade. Find out why.

The Sea to Summit Boab -1 is a versatile three season sleeping bag made from 100% recycled synthetic fibres. It comes in four sizes, so it should be possible to find a version to suit most people.

Lucy Wallace’s Greener Choice

With 100% recycled materials, the Boab is a greener choice for those seeking to reduce their ecological footprint.
Pros
  • true to life temp rating
  • decent size range
Cons
  • pricier end of budget
Quick specs
Price: $159 / £130 – £140 for wide and x-long sizes (available from Tiso)
Weight: 1502g
Fill: 100% recycled post-consumer synthetic insulation
Shell: 50D recycled polyester with non-PFC DWR treatment
Construction: offset synthetic fill layers
Length: 185cm (regular)
Rating: limit -1°C, extreme -9°C
Sizes: short, regular, regular wide, long
Women’s/men’s version: Unisex
seatosummit.co.uk

The shape is a gently tapering mummy design, with a square footbox and zip configuration, allowing the bag to be opened completely to use as a quilt in warmer temperatures. Alternatively, you can simply open the bottom to allow extra airflow by the feet.

There’s a generous hood which is easily adjustable, but no neck baffle which limits use in colder temperatures. I found that the temperature rating is pretty accurate. I sleep cold and usually need a warmer bag than recommended but the Boab rating seemed fair to me. I tested the Boab -1 in damp conditions in springtime, including one night where the temperature dropped below freezing in the early hours. Although I was chilly, I still managed to sleep, indicating that the bag performed well at its advertised temperature rating.

The Boab -1 is also a comfortable bag to use. The fabrics are soft to the touch and manage sweat moisture well. I particularly like the soft drawcord, reducing the annoyance of a nylon knot that flops in your face as you sleep.

It’s bulky, and not the lightest, but it comes with a compression sack that squishes the bag small enough to be used for overnight backpacks at a push. The Boab -1 is a little more expensive than some of the other bags in this test but because of the quality and performance, still represents excellent value for money if the budget can be stretched.

With 100% recycled materials, the Boab is also a greener choice for those seeking to reduce their ecological footprint.

Testing Conditions

Lucy Wallace is 5’6” with narrow shoulders and is a cold sleeper. The bags were tested on overnight camps in Wales in mixed, rainy and cool conditions. Weights supplied using her own digital scales and include the stuff sack. This review was first published in the August 2025 issue of The Great Outdoors.