This carries everything you need if you have to run out of the house to pick the kids up from school, go to market or the gym.  When I need to carry more going to work or school, like many others who purchased this I stick this in a larger bag and then I'm set.

I have a Motorola Razr Maxx which is a pretty large screen phone.  It fits in the Iris wristlet without the case and is pretty secure even if I don't snap it it.  Unfortunately it's a very tight fit with the case making it very difficult to pull in and out.  Since I'm pretty gentle on my phones, I opted to use the wristlet without putting the phone in the silcone gel case.