I would say not very. If you had a decent size frame bag you could jam it in. Its a pretty heavy duty jacket that I would normally use for grim days like this week where it honestly kept me bone dry. If you want something packable the all road rain shell is good (about the size of a water bottle) but its very bike fit so not ideal for going to the shops or town.
I'm not looking for jersey pocket small, just don't want a massive thick thing that takes up a heap of room in a bag and is correspondingly too warm for 15 degrees plus.
I would say not very. If you had a decent size frame bag you could jam it in. Its a pretty heavy duty jacket that I would normally use for grim days like this week where it honestly kept me bone dry. If you want something packable the all road rain shell is good (about the size of a water bottle) but its very bike fit so not ideal for going to the shops or town.