I have a Lumia 521 with a "tech21" case on it. I searched carefully online for a pouch that would accommodate the phone with the case on it. This pouch turned out to be a perfect fit. It was slight snug at first, but it quickly "loosened up" so it''s just right now. The pouch seem to be rugged enough. The clip design is perfect. I don''t have to worry about the pouch coming off my belt. I recommend this pouch. Oh, and I like that it has Velcro instead of a magnet. I previously bought a different case that has a magnet closure and it would not stay closed.