See, I don't like carrying a purse. My shoulders aren't wide enough to support them. I've been using a wallet case on my 5S since the beginning of the summer. It's very easy to put on and take off. My Incipio Feather takes a minute in comparison, but it's a worthwhile ritual to deal with and I only do it when I know I'll need money on hand.
Easy enough to cram a few receipts in there too, aswell as cash.
I'd gladly hang an iPhone 6+ around my neck like a camera if someone makes a case to do so.
I stuff the iPad Mini into my jacket, but you can't wear those all the time.