The Lastu packs down small when needed - don it when the weather turns windier, or starts to rain. Its 2.5 layer structure is lightweight both when worn and in your backpack. A good choice in case it rains, or as a lightweight general purpose shell.
Waterproof, windproof, breathable DrymaxX All Weather 2.5 L
Ventilation slits under arms and both front and rear panels
Two zipper pockets
PFC-free product
50% of the surface fabric is recycled
Bluesign product