Sometimes I don't want to take a purse with me but I have to drive somewhere and I need my debit card when I get there.  This wallet attaches to my bra strap and I can put those items, cash and even car/house keys in it.  I can go anywhere in the restaurant, club, etc. without having to worry about somebody emptying my purse while I'm away from the table.  I think every woman should have one of these.  I bought one for each of my grown daughters and they use them a lot.