The advantage of a front bag is that you can keep all your valuables (like wallet and sunglasses) in it and easily take it with you when ever you leave the bike. I also keep my toilet bag and towel in the front bag and it goes with me to the showers when I'm in a campground. A front bag is also invaluable as a place to store drinks, food, maps and phone for easy access while riding. I also use rear jersey pockets to hold snacks, but the front bag is useful for bulkier items.