Lightweight, stylish, waterproof, wind proof, scrunch proof… A travel jacket / parka / windcheater is the best when layered over other clothes and protecting you from the elements. A detachable hood is a bonus. I am still on the lookout for a great waterproof one, I usually take a puffy jacket then a waterproof thin poncho jacket to put over the top.
Alas, my four pound Primark ‘packed in a bag’ poncho was in my stolen backpack last year. Sad Face. I think I’ll buy a parka though for my next travel jacket to eliminate the need for 2 jackets.
Here are some options I like: