You need to decide if you want down or synthetic, obviously both have pros and cons.
Rab, Mountain Equipment and TNF are widely available.
Adding a liner (or wearing extra clothes) when needed, as you mentioned is a good way to save carrying a warmer bag in the summer
There were some good offers on Moutain Equipment down bags I saw earlier this month
@Moonboy started
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You need to decide if you want down or synthetic, obviously both have pros and cons.
Rab, Mountain Equipment and TNF are widely available.
Adding a liner (or wearing extra clothes) when needed, as you mentioned is a good way to save carrying a warmer bag in the summer
There were some good offers on Moutain Equipment down bags I saw earlier this month