Did the case for my Iphone 4 bought. Since I use the Bumper and also another case, I chose this size of the bag. Should you Iphone 4 Bumper or case without use, I would recommend the bag one size smaller. But please note: It takes some time until the bag has become "accustomed" to the phone. This means that the bag expands a bit. After a few weeks the phone fits perfectly. Furthermore, the bag will cost, in a different package, at a major electronics retailer 29.99! What more do you want.
Positives:
+ Good workmanship + Flat + Looks good + Good price
Negatives: - The Velcro could be slightly larger, so that it stands better.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Addendum on 02/07/2012 After more than 20 months of daily use, the bag still holds just fine. The lining dissolves slowly now, but that's ok. I'm going to get twice as a bag! Strong buy recommendation continues ...