The bag fits perfectly for the S4 at no additional cases.
Because I but both the flip cover, and a protective cover specifically for the flip cover have, I was only a little sad because I can not use the beautiful bag.
I then but overnight "crammed" a book and lo and behold, the next morning fit the S4 together with flip-cover and cover purely perfect.
I find great that the pocket is stretchable.
The leather looks very high, it'll still take me in other colors.
Conclusion: Beautiful bag, which can be stretched if desired.
Just buy it !!