I bought the bag for my Samsung S3! In other descriptions that size was (XL) recommended for exactly this phone! Unfortunately, it definitely does not fit the S3 !!! The phone goes in very tight so that while the side buttons (high, low, off) will inevitably operated! If you have now installed more Kunstoffcase or the larger battery with a bit thicker cover, has my no more chance!
Conclusion: Very noble and well-made cell phone pocket - but unfortunately not suitable for S3!