Hi Crew have had several FO bags over the yrs & they all seem to be too small for my boards.
I have a 10' board & it is to long for my 10' FO bag ?????? 
Yeah they are an awesome fitted board bag.
Try your board in them or buy one size up to be safe. Not all boards are dimensions they say they are
Common sense.
Select to expand quoteRossall said..
my 10 Ft x 29 Sunova Style doesn't fit in my 10ft FO bag, short by 2"
Same Same , board measures 10'
bag 10' OA not internal 
Same experience for me. Brand new Smik Style Lord 10' x 30" and was about 2-3" too long for the FO 10' x 30" bag. Thought the board might have some additional length but it was 10' on the knocker. Ended up getting a Surf Aids custom bag instead which is awesome.
Could have gone the 10'6" x 30" but then you have all that extra at the tail flapping about. I have also had issues with the FO 14' bags not fitting so does not appear to be solely an issue for Surf SUP's
I have a 10'x30" Fanatic Stylemaster fits in the FO 10'x30" board bag with no problems. I also have an 8'5" Starboard (that actually measures out to 8'6") that fits their 8'6" bag with a couple inches to spare as well as a 7'8" that is a great fit in FO's stubbie bag (again with a couple inches to spare). I realize that there is a great variety in sup shapes and volumes and all boards of the same length may not fit in the same bag.However, it has not been my experience that FO bags in general run short and I appreciate their making a more fitted product than a lot of other bags on the market. I agree that it is always a good idea to try your board in the bag if possible. As I live in the States I contacted FO and asked them about the fit on my particular boards before ordering. I found them very helpful. I have owned the 7'10" bag for over a year and it has been great bag. I recently purchased the 10' and the 8'6" bags.
I've got a 10' cover that fits a 10' board but it is tighter than a fishes a$$hole
I'm happy with the cover, but would definitely want to check sizing before buying another.
Sounds pretty typical of everyone else's experience.
I thought of cutting a piece of my boards off 
got a 10.5 board cover instead .wetsuit and paddle fit in it now. 
