We add a little extra length to each bag so that your bag and board length should be the same. (i.e. an 8'0" board will fit in an 8'0" bag) If you are in between sizes, go up to the next length. If you are using your bag for protection while on the roof of your car, or in the back of your truck, one of our Daylight Bags may be all the protection you need. For more everyday protection consider one of our more heavy duty Deluxe series bags.