The Cosmic 20 synthetic sleeping bag is very good value if your main selection criteria are warmth and overall price, It’s worth comparing this bag to others in our guide Best three-season sleeping bags for hiking 2023. The comfort rating of -4°C may be a little ambitious for me (I’m a cold sleeper) but I was warm and cosy sleeping  in my campervan, despite when I awoke there being ice on the inside of the windows and a hard frost outside.  

Price: £90 | Weight: 1856g | Fill: 1300g CirroLoft | Shell: 380T nylon taffeta | Construction: synthetic fill | Zip: Kelty’s own brand ¾-length two-way | Length: 188cm | Rating: comfort -4°C, limit -11°C | Sizes: one | Men’s version: yes

The bag features generous but non-adjustable front and back neck baffles, and a baffle behind the zip with anti-snag reinforcement. The mummy hood has a drawcord so that it can be tightened to keep heat in around the face. 

At 188cm long, it’s still long enough for people up to 172cm tall. It’s also quite wide around the footbox, providing some wiggle room for side sleepers. It’s heavy at 1856g, but it’s worth noting that it’s the only bag I tested whose advertised weight (1810g) was anything like its measured weight.

Kelty’s proprietary CirroLoft synthetic fibres do feel quite stiff and bulky, and this is reflected in the lack of compressibility when the bag is stuffed.  Its minimum pack size is 41x25cm, which takes up a lot of precious room in a backpack. For this reason it’s best suited to car camping, and this is the main drawback to what is otherwise a warm and affordable sleeping bag.