18L is the perfect size pack for everyday use. A favorite feature on this pack has to be the stretchy cord that you see in the photo. When you want an extra layer easily accessible, or need to stow a sleeping pad on your pack, this bungee is a lifesaver. The mesh pockets are big enough to hold water bottles, or snacks, for your daily trips. Don't forget to throw your sunglasses in the fleece pocket to protect them and enjoy the convenience of this day pack.