If you're an avid traveler, the word “packable” is music to your ears—space in a carry-on or checked bag is always precious, and any chance to save it is appreciated. But even if you aren't traveling far this fall, there's much to be said for a packable jacket that'll keep you warm and dry, without the bulk. An extra layer thrown in at the last minute might be the thing that saves you on a colder-than-expected ski trip or fall camping adventure; that backup raincoat might be the insurance you need when bad weather threatens to ruin your day on the trails. For those situations and beyond, we turn to packable jackets that are no-brainers to bring along, just in case.