Just got this awesome STP in the mail today and it's the greatest one I have tried so far. No leaks as opposed to many others I have tried and got frustrated with. Makes a nice little budge too! I really recommend the strap that's made for it. You do need those 2 holes to wear it comfortably. Thanks again for your great products! Worth the money!
I like the model A better because the bigger reservoir, but this is nice for a less prominent bulge in the pants!