How packable you need your jacket to be might be very important to you, or it might not. It just depends on your intended usage. If you plan to backpack or canoe into a remote area and need your raingear along to keep you dry in case of an unexpected squall, a jacket that packs down to fill only a very small space in your pack is a must. A bulky, heavy jacket just won't do. On the other hand, if you are going to drive right to your campsite and just need a waterproof jacket in case it rains while you're out gathering wood, a jacket that hardly packs down at all will work—heck, you can even take it to camp on a coat hanger. If you'll be participating in both kinds of activities from time to time, the packable jacket is more versatile and can be used for both types of outing.