I was wondering the dimentions of this product when it is all wrapped up and I also am wondering what the circumference is when it is fully inflated?
3"x8" when it's rolled up, and when filled it is between 4-5.5" depending on how you are facing it.
Going off memory the SMB's dimensions when rolled up are around +3" in diameter and 8" long. It is pretty big when blown up (maybe as beig as 6" diameter). This is not the regular size recreational safety sausage.
It is about 3" dia when rolled up tightly and about 7" long when rolled up. It fits nicely in a BC pocket as it can be collapsed/flattened or can be clipped to the outside of a BC. Fully inflated I seem to remember it is about 6 feet long. We are very satisfied with it.
I'm not sure of the exact dimensions while wrapped up but it is pretty big. It does not fit in the pocket of my Zeagle Stilleto BC. A good solution though is to have the SMB and a reel attached to the back/bottom of the BC just above your butt. This allows it to be out of the way and doesn't drag on the bottom, is more streamlined becuase the SMB is in the cylinders draft and since it is on your backside, you are able to access it with either hand in the event one hand is incapacitated. One thing I do not like about the SMB that I got was that it does not offer an oral inflate. This is helpfull for when you get to the surface. The SMB deploys perfect while at depth but when you get to the surface it kind of goes limp. DAN does have a new SMB that is just like this one but it does offer an oral inflate while at the surface. With either SMB you get from DAN, a charter boat will have no problem spotting you. I used it two weeks ago in Jupiter, Fl and the waves were about 4-5ft which would have swallowed up a normal size SMB but the charter captain had no problem locating me and my dive buddy with this SMB. Good luck.