I have no idea how it happened, but despite having measured the size before ordering, once it arrived I was really surprised by how big it is. So I use it for storage instead of carrying my gear, since otherwise it's going to look like I'm being carried by the bag instead (and there's no way I'll be able to handle it comfortably once it's filled to the top either). But that's neither a pro or con. It's just BIG.
I do not like the way the longer carrying strap is attached, however. It makes no sense to me and is not comfortable in any way. You can't open or close the bag properly with it on - the only way I see it functioning is you should remove it while packing and only put it on to actually carry the bag. So I have never used the long strap - it just lives in the side pocket if the day arrives when it's needed.
All in all, a huge bag, nice quality, good for large pieces of equipment or storing all your gear.