If you want one jacket that you use in bounds and out, the men's Burton [ak] Hover GORE-TEX C-Knit 3L Stretch Jacket is one of the lightest, most packable shells in the [ak] line.
Not into branding? The Solid Short Sleeve Pocket Tee is a perfect staple piece for your wardrobe, letting you fly under the radar while still having the best quality, medium weight, 100% cotton, modern fit look.