That’s the advice there in the title. Bag one. Not only will it serve you well in a “sling it on, there’s rain expected” kind of way, it also works as a tougher than normal outer shell when autumn begins to show up. Berghaus have been doing this sort of thing for years but only recently have they focused on their heyday of heritage via the Dean Street collection.
Terraces have this in the sale, currently. You should check it out.
See all Berghaus at Terraces here.