I have a backback. I think its easier to carry than a shoulder bag. I also carry a handbag. I tried to go without it a couple of times and it didn't work for me. If my phone rings I don't want to be trying to get it out from behind me, I don't like having to take my bag off my back every time I want my wallet and DH carries it too and I don't like having to chase him around if I want to get my wallet or sunnies. Also a fab handbag which matches the rest of your outfit nicely makes you feel a bit more glam. From a security point of view it is ridiculously easy for a pickpocket to empty the back pockets of a backpack without you noticing but I geuss that its not an issue in many places.