I bought this for those trips when you just can't quite get everything you need packed in the bike but you don't want to drag a trailer. This bag attaches to the box rack securely and quickly. There's a handle built in so it's easy to carry into a hotel with you. It also has a rain cover built into a small pocket. If it starts raining it pops out and over the bag very quickly and since it's built in, you won't lose it or use up other space for the cover. I don't use this bag on all of our trips but when I do need it, I LOVE it.